1. Research Division, Institute of Mental Health , 10 Buangkok View, Singapore 539747 , Singapore
2. Saw Swee Hock School of Public Health, National University Hospital , Singapore
3. Lee Kong Chian School of Medicine, Nanyang Technological University , 50 Nanyang Avenue , Singapore
4. Admiralty Medical Centre, Khoo Teck Puat Hospital , 676 Woodlands Drive 71 , Singapore
5. National Healthcare Group Polyclinics , 3 Fusionopolis Link, Nexus@One-North , Singapore
6. Department of Exercise and Nutrition Sciences, Milken Institute of Public Health, The George Washington University , Washington, DC , USA