title: 13th Annual C. Walton Lillehei Memorial Lecture--Invisible problems in cardiovascular surgery: what we can learn from prospective observational studies?
authors: The Division of Cardiothoracic Surgery, Department of Surgery, Medical College of Wisconsin and the Herma Heart Center, Children's Hospital of Wisconsin, Milwaukee, Wisconsin 53226, USA. jtweddell@chw.org
authors: James S
authors: JS
authors: Tweddell
mesh_terms: D006348:Cardiac Surgical Procedures; D006330:Heart Defects, Congenital / Q000601:surgery*; D006801:Humans; D019370:Observation; D017063:Outcome Assessment, Health Care; D011446:Prospective Studies; D012107:Research Design