Affiliation: | (1) School of Public Health and Department of Community and Family Medicine, Faculty of Medicine, Chinese University of Hong Kong, Hong Kong, China;(2) Hospital Authority, Hong Kong SAR. 11/F, clinical sciences building, Prince of Wales Hospital, Shatin, NT, Hong Kong, China;(3) General Practice and Primary Care, Division of Community-based sciences, Faculty of Medicine, University of Glasgow, Glasgow, G12 9LX, UK |