1. Gerontology Program J. F. Oberlin University Graduate School of International Studies Sendagaya Campus, 1‐1‐12 Sendagaya, Shibuya‐ku Tokyo 151‐0051 Japan
2. Department of Urban Science and Policy Tokyo Metropolitan University 1‐1 Minami‐Osawa, Hachioji‐shi Tokyo 192‐0397 Japan
3. Research Team for Social Participation and Community Health Tokyo Metropolitan Institute of Gerontology 35‐2 Sakae‐cho, Itabashi‐ku Tokyo 173‐0015 Japan
4. Healthy Aging Innovation Center Tokyo Metropolitan Institute of Gerontology 35‐2 Sakae‐cho Itabashi‐ku Tokyo 173‐0015 Japan
5. Department of Health Management and Policy University of Michigan School of Public Health 1415 Washington Heights Ann Arbor Michigan 48109‐2029 USA
6. Department of Healthcare Management and Healthy Aging Research Center Chang Gung University 7F Management Building, No. 259, Wenhua 1st Rd., Guishan District Taoyuan City 33302 Taiwan