1. Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Kowloon, Hong Kong
2. Physiotherapy Department, Shatin Hospital, Shatin, Hong Kong
3. Department of Rehabilitation, Jiangsu Provincial Yixing Jiuru Rehabilitation Hospital, Yixing, China
4. Medical and Geriatric Unit, Shatin Hospital, Shatin, Hong Kong
5. Department of Medicine and Therapeutics, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong