1. Department of Prevention and Care Science, National Center for Geriatrics and Gerontology , 7-430 Morioka, Obu, Aichi 474-8511 , Japan
2. Center for Integrated Science and Humanities, Fukushima Medical University , Hikarigaoka, Fukushima-shi, Fukushima 960-1295 , Japan
3. Department of Health and Psychosocial Medicine, Aichi Medical University School of Medicine , Nagakute, Aichi 480-1195 , Japan
4. Department of Epidemiology and Preventive Medicine, Kagoshima University Graduate School of Medical and Dental Sciences , Kagoshima 890-8544 , Japan