Severe acute respiratory syndrome coronavirus 2 prevalence in saliva and gastric and intestinal fluid in patients undergoing gastrointestinal endoscopy in coronavirus disease 2019 endemic areas: Prospective cross‐sectional study in Japan
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A. Ryo | A. Nakajima | Y. Yamaoka | T. Higurashi | S. Kato | S. Maeda | H. Kaneko | Tetsuya Yamamoto | T. Takatsu | K. Ashikari | Takamitsu Sato | S. Miyake | I. Watari | H. Kuwashima | K. Nagai