Abu Saleh M Abdullah1,2
, Tai-Hing Lam2
, Steve KK Chan2
, Gabriel M Leung2
, Iris Chi3
, Winnie WN Ho2,5
and Sophia SC Chan4 
1
Department of International Health, Boston University School of Public Health, Boston, Massachusetts, USA
2
Department of Community Medicine, School of Public Health, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, PR China
3
School of Social Work, University of Southern California, Los Angela, USA
4
Department of Nursing Studies, Li Ka Sing Faculty of Medicine, The University of Hong Kong, Hong Kong, PR China
5
Department of Social Work, Hong Kong Baptist University, Hong Kong, PR China