Associated organs and system with COVID-19 death with information of organ support: a multicenter observational study. - Nakayama, Ryuichi; Bunya, Naofumi; Tagami, Takashi; Hayakawa, Mineji; Yamakawa, Kazuma; Endo, Akira; Ogura, Takayuki; Hirayama, Atsushi; Yasunaga, Hideo; Uemura, Shuji; Narimatsu, Eichi (BMC Infectious Diseases, 2023)