Risk factors for aggravated COVID-19 despite medical care after admission among Japanese patients: A Japanese association for infectious diseases COVID registry study - Itaru Nakamura; Yusuke Koizumi; Hideki Araoka; Hiroaki Hata; Takashi Miki; Yusuke Tanaka; Chie Kobayashi; Kazuyoshi Kawakami (PLoS ONE, 2025)