Publications by authors named "Thi Thanh Le"

14 Publications

  • Page 1 of 1

Enhanced NH and H gas sensing with HS gas interference using multilayer SnO/Pt/WO nanofilms.

J Hazard Mater 2021 Jun 19;412:125181. Epub 2021 Jan 19.

Faculty of Electrical and Electronic Engineering, Phenikaa University, Hanoi, Viet Nam; Phenikaa Research and Technology Institute, A&A Green Phoenix Group, Hanoi, Viet Nam. Electronic address:

The selective detection and classification of NH and HS gases with HS gas interference based on conventional SnO thin film sensors is still the main problem. In this work, three layers of SnO/Pt/WO nanofilms with different WO thicknesses (50, 80, 140, and 260 nm) were fabricated using the sputtering technique. The WO top layer were used as a gas filter to further improve the selectivity of sensors. The effect of WO thickness on the (NH, H, and HS) gas-sensing properties of the sensors was investigated. At the optimal WO thickness of 140 nm, the gas responses of SnO/Pt/WO sensors toward NH and H gases were slightly lower than those of Pt/SnO sensor film, and the gas response of SnO/Pt/WO sensor films to HS gas was almost negligible. The calcification of NH and H gases was effectively conducted by machine learning algorithms. These evidences manifested that SnO/Pt/WO sensor films are suitable for the actual NH detection of NH and HS gases.
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http://dx.doi.org/10.1016/j.jhazmat.2021.125181DOI Listing
June 2021

Metagenomic 16S rDNA amplicon data of microbial diversity of guts in Vietnamese humans with type 2 diabetes and nondiabetic adults.

Data Brief 2021 Feb 24;34:106690. Epub 2020 Dec 24.

National Key Laboratory of Gene Technology, Institute of Biotechnology, Vietnam Academy of Science and Technology, Cau Giay, Hanoi, Vietnam.

Type 2 diabetes mellitus (T2DM) is an important public health problem. The knowledge of bacterial communities in the gut of Vietnamese patients with T2DM and non diabetic controls is still insufficient. We report in this article the 16S rDNA amplicon data of the gut microbiomes of Vietnamese patients with T2DM and nondiabetic controls carried out using the Illumina sequencing. This work included 7 patients and 7 controls. A total of 1,627,646 reads were obtained and a total of 13 phyla, 25 classes, 94 genera were revealed. The top three dominant bacterial phyla in all subjects were Firmicutes, Bacteroidetes and Proteobacteria. Significant differences in the relative abundances of the phylum Firmicutes and class between patients and controls were observed, suggesting that the reducing of phylum Firmicutes and class in the gut may be linked to obesity and T2DM. All sequencing libraries were deposited in the NCBI SRA as BioProject PRJNA668251. The datasets are needed to determine the association between the bacterial composition of the gut and the pathogenesis of T2DM in Vietnamese patients.
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http://dx.doi.org/10.1016/j.dib.2020.106690DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7776958PMC
February 2021

Natural core-shell structure activated carbon beads derived from Litsea glutinosa seeds for removal of methylene blue: Facile preparation, characterization, and adsorption properties.

Environ Res 2020 Nov 18:110481. Epub 2020 Nov 18.

Center for Advanced Chemistry, Institute of Research and Development, Duy Tan University, Da Nang, 550000, Viet Nam; The Faculty of Natural Sciences, Duy Tan University, Da Nang, 550000, Viet Nam. Electronic address:

In this study, natural core-shell structure activated carbon beads (ACBs) from Litsea glutinosa seeds were successfully produced, characterized, and applied for adsorption of methylene blue (MB). The ACBs were prepared using single-step carbonization-activation with NaHCO at the optimized activation temperature, time, and activating agent concentration of 450 °C, 60 min, and 5%, respectively. Batch experiments were performed to determine the optimum adsorption conditions, suitable kinetic and isotherm models, and thermodynamic parameters for the adsorption of MB onto ACBs. The results showed that the ACBs were displayed as highly porous natural core-shell spheres with a diameter of about 5 mm. The adsorption of MB dye on ACBs was a spontaneous endothermic process, followed the Langmuir isotherm and the pseudo-second-order kinetic models with the rate-controlling step of both external diffusion and intra-particle diffusion. At the optimum conditions (pH of 9, the contact time of 10 h, the temperature of 40 °C, and an adsorbent dosage of 6 g/L), the maximum adsorption capacity reached 29.03 mg/g. The thermal method turned out to be more suitable for regenerating ACBs compared to the chemical method. The ACBs exhibited high reusability and stability, its adsorption efficiency could maintain more than 90% after five consecutive cycles of use. The electrostatic attraction, π-π interaction, hydrogen bonding, and pore-filling were identified as primary contributions to the adsorption mechanism. The overall results revealed that the ACBs could be used as a potential adsorbent for removing MB from water media.
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http://dx.doi.org/10.1016/j.envres.2020.110481DOI Listing
November 2020

The Presence of Poultry Influenza Strains in Two Live Bird Markets near the East-West Boundary of Vietnam.

Biomed Res Int 2020 4;2020:1487651. Epub 2020 Jun 4.

Vietnam National Centre for Veterinary Diagnostics, Vietnam.

The spread of avian influenza virus among Asian countries is becoming a concern after influenza epidemics in recent years. This study is aimed at identifying the subtypes of avian influenza viruses collected from healthy chickens and ducks at two live bird markets in a border province of Vietnam and the Lao People Democratic Republic. Cloacal and tracheal swab samples from 100 chickens and 101 ducks were collected in May 2017. All samples were screened to detect avian influenza virus by real-time reverse transcriptase PCR. Samples that are avian influenza virus-positive were isolated in embryonated chicken eggs, and the subtypes were identified by RT-PCR with the specific primers. The samples positive for influenza virus H5 were sequenced to identify HA and NA genes. The prevalence of avian influenza virus (AIV) among chicken and duck samples was 27.5% (55/200) and 24.8% (50/202), respectively. AIV subtypes identified among 17 samples positive with the hemagglutination test include H3N6, H6N6, and H9N2. Of these 17 samples, 7 duck samples were found to be H6N6, 4 duck samples were infected with both subtypes of H3N6 and H6N6, and two chicken samples were recorded as H9N2. A positive chicken sample with A/H5 contains 99% similarity nucleotide with H5N6 reference strain. Results suggested that while the presence of low pathogenic avian influenza virus is predominant, potential risks of the appearance of high pathogen avian influenza virus in the east-west boundary in Vietnam should be concerned and studied further. Furthermore, prevention activities are needed to reduce such biosecurity threats in Vietnam and other Asian countries.
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http://dx.doi.org/10.1155/2020/1487651DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7293723PMC
March 2021

Severe Acute Respiratory Syndrome Coronavirus 2 Shedding by Travelers, Vietnam, 2020.

Emerg Infect Dis 2020 07 21;26(7):1624-1626. Epub 2020 Jun 21.

We analyzed 2 clusters of 12 patients in Vietnam with severe acute respiratory syndrome coronavirus 2 infection during January-February 2020. Analysis indicated virus transmission from a traveler from China. One asymptomatic patient demonstrated virus shedding, indicating potential virus transmission in the absence of clinical signs and symptoms.
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http://dx.doi.org/10.3201/eid2607.200591DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7323563PMC
July 2020

Synthesis of Diatomite-Based Mesoporous Wool-Ball-Like Microspheres and Their Application for Toluene Total Oxidation Reaction.

Nanomaterials (Basel) 2020 Feb 17;10(2). Epub 2020 Feb 17.

Institute of Research and Development, Duy Tan University, Danang 550000, Vietnam.

Diatomite (DE) has attracted considerable attention owing to its abundance, low cost, and potential for a wide variety of applications. This work reports the development of mesoporous wool-ball-like (WBL) microspheres from natural DE through a simple hydrothermal treatment. We discovered that the presence of cetyltrimethylammonium bromide is a prerequisite for generating monodispersed WBL microspheres. The mechanism for the transformation of pristine DE into mesoporous microspheres through dissolution-recrystallization was clearly investigated. Interestingly, the microspheres exhibited a specific surface area 25-60 times larger than that of the pristine DE. The application of WBL microsphere DE as an effective support for metallic catalysts in the toluene total oxidation reaction was demonstrated.
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http://dx.doi.org/10.3390/nano10020339DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7075114PMC
February 2020

Efficient and Precise CRISPR/Cas9-Mediated MECP2 Modifications in Human-Induced Pluripotent Stem Cells.

Front Genet 2019 2;10:625. Epub 2019 Jul 2.

Immune Regulation and Cancer, Max-Delbrück-Center for Molecular Medicine, Berlin, Germany.

Patients with Rett syndrome (RTT) have severe mental and physical disabilities. The majority of RTT patients carry a heterozygous mutation in methyl-CpG binding protein 2 (MECP2), an X-linked gene encoding an epigenetic factor crucial for normal nerve cell function. No curative therapy for RTT syndrome exists, and cellular mechanisms are incompletely understood. Here, we developed a CRISPR/Cas9-mediated system that targets and corrects the disease relevant regions of the MECP2 exon 4 coding sequence. We achieved homologous recombination (HR) efficiencies of 20% to 30% in human cell lines and iPSCs. Furthermore, we successfully introduced a MECP2 mutation into the MECP2 gene in human induced pluripotent stem cells (iPSCs). Consequently, using CRISPR/Cas9, we were able to repair such mutations with high efficiency in human mutant iPSCs. In summary, we provide a new strategy for MECP2 gene targeting that can be potentially translated into gene therapy or for iPSCs-based disease modeling of RTT syndrome.
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http://dx.doi.org/10.3389/fgene.2019.00625DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6614930PMC
July 2019

Fatty Acid, Lipid Classes and Phospholipid Molecular Species Composition of the Marine Clam (Sowerby 1851) from Cua Lo Beach, Nghe An Province, Vietnam.

Molecules 2019 Mar 4;24(5). Epub 2019 Mar 4.

Institute of Natural Products Chemistry, Vietnam Academy of Science and Technology, Hanoi 122100, Vietnam.

This study aims to analyze compositions of fatty acids and phospholipid molecular species in the hard clams (Sowerby, 1851) harvested from Cua Lo beach, Nghe An province, Viet Nam. Total lipid of hard clams occupied 1.7 ± 0.2% of wet weight and contained six classes: hydrocarbon and wax (HW), triacylglycerol (TAG), free fatty acids (FFA), sterol (ST), polar lipid (PoL), and monoalkyl diacylglycerol (MADAG). Among the constituents, the proportion of PoL accounted was highest, at 45.7%. In contrast, the figures for MADAG were lowest, at 1.3%. Twenty-six fatty acids were identified with the ratios of USAFA/SAFA was 2. The percentage of n-3 PUFA (ω-3) and n-6 PUFA (ω-6) was high, occupying 38.4% of total FA. Among PUFAs, arachidonic acid (AA, 20:4n-6), eicosapentaenoic acid (EPA, 20:5n-3), docosapentaenoic acid (DPA, 22:5n-3), and docosahexaenoic acid (DHA, 22:6n-3) accounted for 3.8%, 7.8%, 2.2% and 12.0% of total lipid of the clam respectively. Phospholipid molecular species were identified in polar lipids of the clams consisting six types: phosphatidylethalnolamine (PE, with 28 molecular species), phosphatidylcholine (PC, with 26 molecular species), phosphatidylserine (PS, with 18 molecular species), phosphatidylinositol (PI, with 10 molecular species), phosphatidylglycerol (PG, with only one molecular species), and ceramide aminoethylphosphonate (CAEP, with 15 molecular species). This is the first time that the molecular species of sphingophospholipid were determined, in in particular, and for clams in general. Phospholipid formula species of PE and PS were revealed to comprise two kinds: Alkenyl acyl glycerophosphoethanolamine and Alkenyl acyl glycerophosphoserine occupy 80.3% and 81.0% of total PE and PS species, respectively. In contrast, the percentage of diacyl glycero phosphatidylcholine was twice as high as that of PakCho in total PC, at 69.3, in comparison with 30.7%. In addition, phospholipid formula species of PI and PG comprised only diacyl glycoro phospholipids. PE 36:1 (p18:0/18:1), PC 38:6 (16:0/22:6), PS 38:1 (p18:0/20:1), PI 40:5 (20:1/20:4), PG 32:0 (16:0/16:0) and CAEP 34:2 (16:2/d18:0) were the major molecular species.
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http://dx.doi.org/10.3390/molecules24050895DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6429517PMC
March 2019

Circulation of influenza B lineages in northern Viet Nam, 2007-2014.

Western Pac Surveill Response J 2015 Oct-Dec;6(4):17-23. Epub 2015 Nov 11.

National Institute of Hygiene and Epidemiology, Ha Noi, Viet Nam .

Introduction: Influenza B viruses circulate throughout Viet Nam, and their activities vary by region. There have been two antigenically distinct lineages of influenza B viruses co-circulating in the past 20 years; however, only one lineage is selected as a component of contemporary trivalent seasonal influenza vaccines. To improve the understanding of circulating influenza B lineages and influenza vaccine mismatches, we report the virus lineages circulating in northern Viet Nam over an eight-year period (2007-2014).

Methods: Lineages of 331 influenza B viruses were characterized by haemagglutination inhibition assay against standard reference ferret (Yamagata) and sheep (Victoria) antisera. Sequence analysis of the haemagglutinin gene was performed in 64 selected influenza B isolates.

Results: The proportion of influenza B lineages changed by year. The Yamagata lineage predominated in 2007, 2008 and 2012; the Victoria lineage predominated in 2009-2014 except 2012. The two lineages showed continuous evolution over time. The Northern Hemisphere's influenza vaccine components were mismatched with the predominant circulating viruses in 2007, 2009 and 2014.

Discussion: The seasonality of influenza B activity is more variable in tropical and subtropical regions than in temperate zones. Our data showed a common co-circulation of both influenza B lineages in northern Viet Nam, and it was difficult to predict which one was the predominant lineage. Quadrivalent influenza vaccines containing both lineages may improve the effectiveness of influenza vaccine programmes in the future.
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http://dx.doi.org/10.5365/WPSAR.2015.6.1.022DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4712529PMC
October 2016

Potential for the development of a marketing option for the specialty local Ban pork of a Thai ethnic smallholder cooperative group in Northwest Vietnam.

Trop Anim Health Prod 2016 Feb 3;48(2):263-71. Epub 2015 Nov 3.

Department of Animal Husbandry and Breeding in the Tropics and Subtropics, University of Hohenheim, Stuttgart, Germany.

Based on 12 years of research (SFB 564 "The Uplands Program"), a community-based breeding and marketing cooperative group was transferred to an ethnic farmer group. This study analyses the potential for developing a marketing channel for specialty local Ban pork as an alternative to supplying the local markets to ensure long-term sustainability of the communal local pig breeding and production system. Data on pig-keeping were investigated from 378 farmers who wanted to enroll in the cooperative group in 10 villages (near town, intermediate, and remote zones) in Son La province. The data on Ban pig marketing activities of the cooperative group were investigated for all of its 180 members. Information on the market demand for Ban pigs were collected by interviewing 57 traders in Hanoi city and Son La province. The results show a dominance of local Ban in remote areas, and a preference for crossbreds with exotics in closer-to-town areas. Before farmers joined the cooperative group, the commercialization of pigs in remote villages accounted for only 3.0 pigs/farm/year compared to 9.3 pigs/farm/year in the intermediate zone and 11.2 pigs/farm/year near town. Potential markets have been identified for each product category of the cooperative group. Pure Ban pigs with a weight of 10-15 kg were preferred most by customers in Hanoi city. The regular feedback of information on niche markets for different products has increased the awareness of farmers about the competitiveness of the local pig products, and the power of collective action in the market. Selected pure Ban pigs were increasingly sold to food stores in Hanoi with high prices. Farmers received an average of 9000 VND more compared to the local market price for each kg of live weight. The respective added value for the cooperative group amounted to 11,300 VND/kg live weight. The added value from selling specialty Ban pigs regularly to markets, encouraged farmers toward a market in local pig production and participation in the cooperative group. For the long-term development of the cooperative group, trademark registration is envisaged, along with strict quality control to help protect the brand of the product.
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http://dx.doi.org/10.1007/s11250-015-0945-xDOI Listing
February 2016

Oral administration of Bifidobacterium spp. improves insulin resistance, induces adiponectin, and prevents inflammatory adipokine expressions.

Biomed Res 2014 ;35(5):303-10

Department of Food Microbiology, National Institute for Food Control.

The intestinal microbiome might be an important contributor to the development of type 2 diabetes. This study was designed to test the hypothesis that oral administration of Bifidobacterium species (spp.) (including B. longum, B. bifidum, B. infantis, and B. animalis) may both ameliorate insulin resistance and reduce the expressions of inflammatory adipocytokines. Male Swiss-Webster mice fed a high-fat diet with or without oral administration of Bifidobacterium spp. for 5 weeks were subjected to an insulin tolerance test and an oral glucose tolerance test. Plasma levels of glucose at 30, 60, 90 and 120 min after insulin injection or glucose administration were significantly lower in the Bifidobacterium spp. than in the control group (P < 0.05), showing the beneficial effect of oral administration on insulin resistance in obese Swiss mice. In addition, Bifidobacterium spp. increased the adiponectin mRNA level and decreased those of monocyte chemoattractant protein 1 and interleukin 6 in non-diabetic C57BL/6J mice fed a normal diet, indicating a molecular mechanism which may ameliorate the inflammatory state, thereby reducing insulin resistance. In conclusion, oral administration of Bifidobacterium spp. improves insulin resistance and glucose tolerance in obese mice by reducing inflammation, as it does in the lean state.
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http://dx.doi.org/10.2220/biomedres.35.303DOI Listing
June 2015

Attitudes toward nonsmoking policies and tobacco tax increases: a cross-sectional study among Vietnamese adults.

Asia Pac J Public Health 2015 Mar 2;27(2):NP947-57. Epub 2012 Oct 2.

Center for Disease Control and Prevention, Atlanta, GA, USA.

Following the 2009 update of the 2005 Framework Convention on Tobacco Control, Vietnam issued a new policy to ban smoking at workplaces and public places. This cross-sectional survey explored public attitudes toward this new regulation and provides evidence to inform future laws. Using stratified cluster sampling, 10 383 Vietnamese people older than 15 years were drawn from 11 142 selected households. Policies mandating "no smoking at workplaces" were supported by 88.7% of Vietnamese adults, whereas "no smoking in public places" and "increasing the tobacco tax" received less support. Educational level, knowledge of health effects, access to information on quitting and smoking health risks, smoking status, ethnicity, and region had significant associations with positive attitudes toward all 3 tobacco control policies. Adults belonging to the non-Kinh ethnic group, those who do not live in the Red river delta, people with lower educational levels, and current smokers should be targeted in tobacco control communication programs.
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http://dx.doi.org/10.1177/1010539512460568DOI Listing
March 2015

Sanitation behavior among schoolchildren in a multi-ethnic area of Northern rural Vietnam.

BMC Public Health 2012 Feb 21;12:140. Epub 2012 Feb 21.

Department of Environmental Health, Institute for Preventive Medicine and Public Health, Hanoi Medical University, Hanoi, Vietnam.

Background: In Vietnam, efforts are underway to improve latrine use in rural and remote areas with particular focus on increasing coverage of sanitation in schools. However, there is a lack of information on how the school program affects latrine use by schoolchildren and at community level. This paper analyzes sanitation use among schoolchildren in a multi-ethnic area to inform future school-based sanitation promotion programmes.

Methods: A combination of quantitative and qualitative methods was applied during a 5 months period in six primary and secondary schools and in the homes of schoolchildren in four different ethnic villages in Northern rural Vietnam. Using a structured questionnaire, 319 children were interviewed face-to-face to collect quantitative data. Qualitative methods included extensive observations at schools and in the homes of 20 children, a single day's diary writings of 234 children, in-depth interviews with children (20), their parents (20) and school staff (10), and focus group discussions with parents (4) and teachers (6), and picture drawing with children (12).

Results: All surveyed schools had student latrines. However, the observed schoolchildren most commonly urinated and defecated in the open. Main barriers for latrine use included inadequate number of latrines, limited accessibility to latrines, lack of constant water supply in latrines and lack of latrine maintenance by school management. Programs promoting latrine use for children were not conducted in either schools or communities and were not established as a preferred social norm in such settings. Children perceived existing school latrines as unappealing and expressed a wish to have basic, functional, clean, and colorful school latrines with privacy.

Conclusions: The paper shows that the current school based sanitation promotion is insufficient to change sanitation behavior of school children irrespective of their ethnicity. It is important that schools, households and communities work more closely together to increase use and uptake of latrine use among schoolchildren. Also, the contractors of latrine facilities must work more closely with local school management when constructing latrines, including identifying location, design and appropriate systems of water supply. A separate budget needs to be allocated to allow the school to maintain the sanitation infrastructure and keep it hygienic and appealing for users.
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http://dx.doi.org/10.1186/1471-2458-12-140DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3305623PMC
February 2012

Sexually transmitted infections in female sex workers in five border provinces of Vietnam.

Sex Transm Dis 2005 Sep;32(9):550-6

Pasteur Institute, Ho Chi Minh City, Vietnam.

Background: Although high prevalences of sexually transmitted infections (STIs) have been reported among female sex workers (FSWs) in some countries of Asia, there is little data about this issue in Vietnam.

Goal: The goal of this study was to determine 1) the prevalence of selected STIs and correlates of chlamydia or gonococcal infection, and 2) contraceptive practices, STI-related symptoms, and healthcare-seeking behavior in FSWs in border provinces of Vietnam.

Methods: Nine hundred eleven FSWs in five border provinces of Vietnam (Lai Chau, Quang Tri, Dong Thap, An Giang, and Kien Giang) were enrolled in a cross-sectional study between December 2002 and January 2003. Study subjects were interviewed about selected sociodemographic and behavioral characteristics, history of STIs, and information about cohabiting partners by a standard interview schedule. Serologic samples were collected for syphilis and urine specimens for gonorrhea and chlamydia. Univariate and multivariate logistic regression analysis was used to determine behavioral and other selected risk factors for gonorrhea/chlamydia among FSWs.

Results: Overall, the prevalences of syphilis, gonorrhea, chlamydia, and gonorrhea/chlamydia among FSWs in the five border provinces were 10.7%, 10.7%, 11.9%, and 19.9%, respectively. The prevalence of gonorrhea/chlamydia was higher in the northern and central regions (27-33%) than in the southern region (11-24%). The prevalence of syphilis was low in Lai Chau (1%), but higher than 10% in the other four border provinces. Among FSWs with cohabiting partners, income < or =33 US$ per month (odds ratio [OR] = 5.8, P = 0.009), ever having worked outside Vietnam (OR = 78.2, P = 0.007), partner's age <30 years (OR = 11.7, P = 0.001), and partner's complaint of burning or pain during sex (OR = 15.6, P = 0.02) were significantly associated with gonorrhea/chlamydia. Among single FSWs, sex work <6 months (OR = 2.6, P <0.001) and ever douching in the last month (OR = 1.7, P = 0.026) were associated with gonorrhea/chlamydia. For all FSWs, a complaint of lower abdominal pain (OR = 1.6, P = 0.028) and sex work <6 months (OR = 2.3, P = 0.001) were significantly associated with gonorrhea/chlamydia.

Conclusions: There is a high prevalence of gonorrhea/chlamydia among FSWs in these border provinces of Vietnam. Correlates of gonorrhea/chlamydia identified in this study could be incorporated into treatment algorithms for cervicitis in FSWs in Vietnam.
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http://dx.doi.org/10.1097/01.olq.0000175415.06716.6dDOI Listing
September 2005