Shunsuke Kondo¹, Yuji Yamada², Mitsuya Katayama³, Kanako Fukuda⁴, Kazuaki Jindai⁵, *Takahiko Tsutsumi¹ (1. Department of General Internal Medicine, Aijinkai Takatsuki General Hospital, 2. Brookdale Department of Geriatrics and Palliative Medicine, Icahn School of Medicine at Mount Sinai, 3. Department of General Internal Medicine, National Hospital Organization Tokyo National Medical Center, 4. Faculty of Medicine and Health Sciences, Yamaguchi University, 5. Department of Virology, Graduate School of Medicine, Tohoku University )