1. School of Nursing, College of Medicine; Chang Gung University; Taoyuan Taiwan
2. Healthy Aging Research Center; Chang Gung University; Taoyuan Taiwan
3. Graduate Institute of Clinical Medical Sciences; Chang Gung University; Taoyuan Taiwan
4. Department of Nursing; MeiHo University; Pingtung Taiwan
5. School of Public Health; University of Michigan; Ann Arbor MI USA
6. Institute of Gerontology; University of Michigan; Ann Arbor MI USA
7. Department of Psychiatry; National Taiwan University Hospital; Taipei Taiwan
8. College of Medicine; National Taiwan University; Taipei Taiwan
9. Graduate Institute of Epidemiology and Preventive Medicine, College of Public Health; National Taiwan University Hospital; Taipei Taiwan
10. Traumatological Division, Department of Orthopedics, Chang Gung Memorial Hospital; Taoyuan Taiwan
11. Department of Internal Medicine, Chang Gung Memorial Hospital; Taoyuan Taiwan