Medicine (Baltimore) 2015 Apr;94(16):e729
From State Key Laboratory of Ultrasound Engineering in Medicine Co-founded by Chongqing and the Ministry of Science and Technology (CQC, RTZ, JW, GHH, KQL, LZ, JB), Chongqing Key Laboratory of Ultrasound in Medicine and Engineering, College of Biomedical Engineering, Chongqing Medical University; Department of Obstetrics and Gynecology (RTZ), Fuling Central Hospital; Department of Obstetrics and Gynecology (YX, LC, KQL), Chongqing Haifu Hospital; Department of Obstetrics and Gynecology (JW), Three Gorges Central Hospital, Chongqing; and Department of Obstetrics and Gynecology (GHH), Suining Central Hospital, Sichuan, China.