1. Department of Applied Social Sciences, The Hong Kong Polytechnic University, Hong Kong
2. Public Policy Research Institute, The Hong Kong Polytechnic University, Hong Kong
3. Department of Social Work, East China Normal University, Shanghai 200241, China
4. Kiang Wu Nursing College of Macau, Macau, China
5. Division of Adolescent Medicine, Department of Pediatrics, Kentucky Children's Hospital, University of Kentucky College of Medicine, Lexington, KY 40506-9983, USA
6. Faculty of Education, The University of Hong Kong, Hong Kong
7. National Institute of Child Health and Human Development, P.O. Box 1260, IL-91012 Jerusalem, Israel