1. Department of Preventive Gerontology, Center for Gerontology and Social Science, National Center for Geriatrics and Gerontology, Obu, Aichi, Japan
2. Graduate School of Human Development and Environment, Kobe University, Nada-ku, Kobe, Japan
3. Department of Health CareScience, Dong-A University, Saha, Busan, Korea
4. Institute for Gerontology, J.F. Oberlin University, Machida, Tokyo, Japan