title: Primum non nocere.
authors.forename: John L
authors.initials: JL
authors.lastname: Petrini
mesh_terms: D000925:Anticoagulants / Q000008:administration & dosage / Q000009:adverse effects*; D016099:Endoscopy, Gastrointestinal / Q000009:adverse effects*; D006471:Gastrointestinal Hemorrhage / Q000209:etiology*; D006801:Humans; D010975:Platelet Aggregation Inhibitors / Q000008:administration & dosage / Q000009:adverse effects*; D019106:Postoperative Hemorrhage / Q000209:etiology*
chemical_list: D000925:Anticoagulants; D010975:Platelet Aggregation Inhibitors