1. Centre on Behavioral Health, The University of Hong Kong, 2/F, Hong Kong Jockey Club Building for Interdisciplinary Research, 5 Sassoon Road, Pokfulam, Hong Kong
2. Department of Social Work and Social Administration, The University of Hong Kong, Hong Kong
3. Department of Psychiatry, The University of Hong Kong, Hong Kong
4. Department of Biostatistics, Harvard School of Public Health, Cambridge, MA, USA