Funding for this research was provided by:
Ministry of Education, Culture, Sports, Science, and Technology (2009-2013)
Grant-in-Aid for Scientific Research (23243070)
Grant-in-Aid for Scientific Research (18390200)
Grant-in-Aid for Scientific Research (25713027)
Grant from National Center for Geriatrics and Gerontology (24-17)
Grant from National Center for Geriatrics and Gerontology (27-18)