1. Yong Loo Lin School of Medicine, National University of Singapore, Singapore; National University Health System, Singapore; Department of Psychology, Singapore Management University, Singapore
2. Department of Geriatric Medicine, Singapore General Hospital, Singapore
3. Yong Loo Lin School of Medicine, National University of Singapore, Singapore; National University Health System, Singapore
4. Nursing Division, Singapore General Hospital, Singapore
5. Department of Psychiatry, The Chinese University of Hong Kong, Hong Kong