HbA1c level may be a risk factor for oxygen therapy requirement in patients with coronavirus disease 2019 by Shinnosuke Yanagisawa, Yoichi Oikawa, Sotaro Takagi, Yuta Horikoshi, Atsushi Satomura, Kazuo Imai, Jun Sakai, Noriomi Ishibashi, Norihito Tarumoto, Shinichiro Iida, Hideto Nakayama, Yoshiyuki Haga, Shigefumi Maesaki, Akira Shimada

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