1. Department of Medical Psychology and Ethics, School of Basic Medical Sciences, Shandong University, Jinan 250012, China
2. Performance and Technology Assessment Department, Ministry of Health, Singapore
3. Geriatric Medicine and Palliative Medicine Department, Ng Teng Fong General Hospital, Singapore
4. Biology of Ageing Laboratory, Singapore Immunology Network (SIgN), Agency for Science Technology and Research (A*STAR), Immunos Building, Biopolis, Singapore
5. Gerontology Research Programme, Department of Psychological Medicine, National University Health System, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
6. Medical Services Department, St Luke’s Hospital, Singapore
7. Rehabilitation Services Division, St Luke’s Hospital, Singapore
8. Psychological Medicine Department, Khoo Teck Puat Hospital, Singapore
9. Nutrition and Dietetics Department, Khoo Teck Puat Hospital, Singapore
10. Geriatric Medicine Department, Khoo Teck Puat Hospital, Singapore
11. Geriatrics Division, Department of Medicine, Research Center on Aging, University of Sherbrooke, Sherbrooke, Quebec, Canada