Guidance for the implementation of a safety checklist for gastrointestinal endoscopic procedures: European Society of Gastrointestinal Endoscopy (ESGE) and European Society of Gastroenterology and Endoscopy Nurses and Associates (ESGENA) Position Statement - Gralnek, Ian M.; Bisschops, Raf; Matharoo, Manmeet; Rutter, Matthew; Veitch, Andrew; Meier, Peter; Beilenhoff, Ulrike; Hassan, Cesare; Dinis-Ribeiro, Mario; Messmann, Helmut (Endoscopy, 2021)