Sense of Life Worth Living (Ikigai) and Mortality in Japan: Ohsaki Study Mizuka Higashiguchi, Masako Kakizaki, Nobutaka Kikuchi, Shinichi Kuriyama, Naoki Nakaya, Kaori Ohmori, Taichi Shimazu, Toshimasa Sone, Ichiro Tsuji in Psychosomatic Medicine (August 2008) Journal Article 1 ikigai