2 Alice Lee Centre for Nursing Studies, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.
3 Department of Clinical Psychology and Psychiatry/School of Public Health, Zhejiang University College of Medicine, Hangzhou, China. A0068932@u.nus.edu.
4 Department of Psychological Medicine, National University Hospital, Singapore, Singapore.
5 National Addiction Management Service, Institute of Mental Health, Singapore, Singapore.