1. Department of Orthopedic Surgery, Wan Fang Hospital, Taipei Medical University, Taipei
2. Department of Orthopedic Surgery, College of Medicine, Taipei Medical University, Taipei
3. Department of Geriatrics and Gerontology, Research Center of Clinical Medicine, National Cheng Kung University Hospital, Tainan
4. Institute of Allied Health Sciences and Departments of Occupational Therapy and Public Health, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, 1 University Rd, Tainan, 701
5. Department of Nursing, School of Health and Welfare, Jönköping University, Jönköping, Sweden