Changes in the characteristics and outcomes of COVID-19 patients from the early pandemic to the delta variant epidemic: a nationwide population-based study by Koichi Miyashita, Hironao Hozumi, Kazuki Furuhashi, Eiji Nakatani, Yusuke Inoue, Hideki Yasui, Masato Karayama, Yuzo Suzuki, Tomoyuki Fujisawa, Noriyuki Enomoto, Naoki Inui, Toshiyuki Ojima, Takafumi Suda

Subjects: “…national database of health insurance claims and specific health checkups of Japan…”
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