Functional capacity in community-dwelling older adults maintained by a higher friend network than family network: implications from a two-year longitudinal study. - Takase, Mai; Takahashi, Kyo; Ogino, Ryogo; Nitanai, Ryoichi; Tanaka, Tomoki; Saisho, Shinya; Goto, Jun; Iijima, Katsuya (BMC Research Notes, 2022)