1 Department of Geriatric and General Medicine, Osaka University Graduate School of Medicine, 2-2 Yamada-oka, Suita, Osaka, 565-0871, Japan. yoichi.nozato@geriat.med.osaka-u.ac.jp.
2 Department of Geriatric and General Medicine, Osaka University Graduate School of Medicine, 2-2 Yamada-oka, Suita, Osaka, 565-0871, Japan.