Novel technique using an echo probe cover prevents oral–fecal transmission of SARS-CoV-2 during urgent colonoscopies - Nishiyama, Noriko; Kobara, Hideki; Tada, Naoya; Matsui, Takanori; Fujihara, Shintaro; Nishiyama, Akira; Masaki, Tsutomu (Endoscopy, 2020)