1. National Clinical Research Center for Geriatric and the Med-X Center for Manufacturing, West China Hospital, Sichuan University, Chengdu, China
2. Rehabilitation Medicine Center, the Institute of Rehabilitation Medicine, and the Key Laboratory of Rehabilitation Medicine in Sichuan Province, Sichuan University, Chengdu, China
3. Department of Systems Design Engineering, University of Waterloo, Waterloo, ON, Canada