title: "Don't look back--something might be gaining on you".
authors: Department of Surgery, University of Toronto, Ontario, Canada.
authors: B
authors: B
authors: Langer
mesh_terms: D003695:Delivery of Health Care; D013505:Digestive System Surgical Procedures; D006266:Health Education; D006801:Humans; D012955:Societies, Medical; D013043:Specialties, Surgical; D014481:United States