1. Department of Applied Social Sciences, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, People's Republic of China
2. Jockey Club Centre for Positive Ageing, Shatin, New Territories, Hong Kong SAR, People's Republic of China
3. Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, People's Republic of China
4. Shatin Hospital & Bradbury Hospice, Shatin, New Territories, Hong Kong SAR, People's Republic of China