Serum cholinesterase associated with COVID-19 pneumonia severity and mortality. Issue 2 (February 2021) - Nakajima, Kento; Abe, Takeru; Saji, Ryo; Ogawa, Fumihiro; Taniguchi, Hayato; Yamaguchi, Keishi; Sakai, Kazuya; Nakagawa, Tomoki; Matsumura, Reo; Oi, Yasufumi; Nishii, Mototsugu; Takeuchi, Ichiro