1. a Centre for Health Behaviours Research, School of Public Health and Primary Care, Faculty of Medicine , The Chinese University of Hong Kong , Hong Kong
2. b Centre for Health Behaviours Research, 5/F., School of Public Health and Primary Care , Prince of Wales Hospital , Shatin, Hong Kong
3. c Community Health Organisation for Intervention, Care and Empowerment (C.H.O.I.C.E.) , Hong Kong , China