COVID-19 severity is associated with the risk of gastrointestinal bleeding by Kazuo Ohtsuka, Yusuke Matsuyama, Ryuichi Okamoto, Masayuki Kurosaki, Hidekazu Ikemiyagi, Shuji Hibiya, Takashi Fujii, Toshimitsu Fujii, Shinji Suzuki, Mayumi Kondo, Shinya Ooka, Yohei Furumoto, Seishin Azuma, Kei Tanaka, Hitoshi Kurata, Shohei Tanaka, Kazuyoshi Nagayama, Fumihiko Kusano, Yasuhiro Iizuka, Takahiro Kawamura, Shinya Sakita, Tsunehito Yauchi, Hideki Watanabe, Ami Kawamoto

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