Affiliation: | 1. Department of Community and Family Medicine, The Chinese University of Hong Kong, HKSAR, Hong KongRoom 421, School of Public Health, Prince of Wales Hospital, Shatin, HKSAR, Hong Kong. Tel: (852) 2252 8777. Fax: 852 2606 3500;2. Department of Community and Family Medicine, The Chinese University of Hong Kong, HKSAR, Hong Kong |