%0 Journal Article
%T For how many days and what types of group activities should older Japanese adults be involved in to maintain health? A 4-year longitudinal study
%A Erika Kobayashi
%A Hiroshi Murayama
%A Hiroyuki Suzuki
%A Kumiko Nonaka
%A Masami Hasebe
%A Takashi Koike
%A Yoshinori Fujiwara
%J Archive of "PLoS ONE".
%D 2017
%R 10.1371/journal.pone.0183829
%U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5598946/