Reduced long-term care cost by social participation among older Japanese adults: a prospective follow-up study in JAGES 論文 Masashige Saito・Jun Aida・Naoki Kondo・Junko Saito・Hirotaka Kato・Yasuhiro Ota・Airi Amemiya・Katsunori Kondo ·2019-03-01 ·『BMJ Open』 9(3) pp. e024439-e024439 doi:10.1136/bmjopen-2018-024439