title: Sunday school.
authors.affiliation: Division of Gastroenterologic and General Surgery, Mayo Clinic and Mayo Foundation, Rochester, Minn. 55905, USA.
authors.forename: M G
authors.initials: MG
authors.lastname: Sarr
mesh_terms: D006801:Humans; D007396:Internship and Residency; D010437:Peptic Ulcer / Q000209:etiology