BMJ 2013 Dec 9;347:f7358. Epub 2013 Dec 9.
British Thoracic Society Chronic Obstructive Pulmonary Disease Specialist Advisory Group, National Heart and Lung Institute, Imperial College, London SW3 6NP, UK.
Biotechnol Lett 2004 Feb;26(3):197-201
Department of Chemical Engineering, Queen's University, Kingston, Ontario, Canada K7L 3N6.