Endoscopic Biopsy Technique using an Alcohol Swab to Prevent Transmission through the Instrument Channel in the COVID-19 Era - Shusei Fukunaga; Taku Manabe; Mitsuhiro Kono; Tadashi Ochiai; Akira Higashimori; Masaki Ominami; Yasuaki Nagami; Yasuhiro Fujiwara (Korean Society of Gastrointestinal Endoscopy, 2021)