title: Service: "sine qua non".
authors.forename: Michael L J
authors.initials: ML
authors.lastname: Apuzzo
mesh_terms: D004992:Ethics, Medical; D014943:Global Health; D006297:Health Services Accessibility / Q000941:ethics; D006625:Hippocratic Oath; D006801:Humans; D009493:Neurosurgery / Q000941:ethics*