Affiliation: | a Hong Kong Department of Health, Chest Services Central Office, Wanchai Polyclinic, Hong Kong, China b Grantham Hospital, Hong Kong, China c Clinical Sciences, London School of Hygiene & Tropical Medicine, London, UK d Department of Infectious Diseases & Bacteriology, Royal Postgraduate Medical School, London, UK e National Institute for Medical Research, London, UK f Department of Medical Microbiology, St. Georges Hospital Medical School, London, UK |