title: How many times have you done this procedure, doctor?
authors.forename: Peter B
authors.initials: PB
authors.lastname: Cotton
mesh_terms: D002983:Clinical Competence / Q000592:standards*; D016099:Endoscopy, Gastrointestinal / Q000592:standards*; D005767:Gastrointestinal Diseases / Q000175:diagnosis* / Q000628:therapy*; D006801:Humans