1. Center for Global Health, Perelman School of Medicine University of Pennsylvania Philadelphia Pennsylvania USA
2. Department of Epidemiology Harvard T.H. Chan School of Public Health Boston Massachusetts USA
3. School of Medicine Chung Shan Medical University Taichung Taiwan
4. Department of Senior Services Industry Management Minghsin University of Science and Technology Hsinchu Taiwan
5. Department of Recreation and Sport Management Shu‐Te University Kaohsiung Taiwan
6. Department of Orthopedics, Cishan Hospital Ministry of Health and Welfare Kaohsiung Taiwan