1. School of Nursing, Chang Gung University of Science and Technology, Taoyuan, Taiwan.
2. Graduate Institute of Nursing, Chang Gung University, Taoyuan, Taiwan.
3. School of Nursing, College of Medicine, Chang Gung University, Taoyuan, Taiwan.
4. Healthy Aging Research Center, Chang Gung University, Taoyuan, Taiwan.
5. Department of Health Management and Policy, School of Public Health, University of Michigan, Ann Arbor, Michigan.
6. Institute of Gerontology, University of Michigan, Ann Arbor, Michigan.
7. Department of Public Health & Biostatistics Consulting Center, Chang Gung University, Taoyuan, Taiwan.
8. Department of Internal Medicine, Chang Gung Memorial Hospital, Taoyuan, Taiwan.
9. Traumatological Division, Department of Orthopedics, Chang Gung Memorial Hospital, Taoyuan, Taiwan.