1. Department of Physical Medicine and Rehabilitation, National Taiwan University Hospital and National Taiwan University, College of Medicine, 7, Chung-Shan South Road, Taipei 100, Taiwan
2. Department of Rehabilitation Medicine, Emory University School of Medicine, Atlanta, GA 30322, USA
3. Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong