1. Department of Family Medicine and Primary Care, School of Clinical Medicine, the University of Hong Kong, Hong Kong, China
2. Department of Statistics and Actuarial Science, the University of Hong Kong, Hong Kong, China
3. Centre for Quantitative Medicine, Duke-NUS Medical School, Singapore
4. Pamela Youde Nethersole Eastern Hospital, Hong Kong, China
5. Department of Family Medicine and Primary Health Care, Hospital Authority Kowloon East Cluster, Hong Kong, China
6. Hong Kong Jockey Club Centre for Suicide Research and Prevention, the University of Hong Kong, Hong Kong, China
7. Department of Social Work and Social Administration, the University of Hong Kong, Hong Kong, China