The Diabetic Postoperative Mortality and Morbidity (DIPOM) trial: rationale and design of a multicenter, randomized, placebo-controlled, clinical trial of metoprolol for patients with diabetes mellitus who are undergoing major noncardiac surgery. - Juul,AB.; Wetterslev,J.; Kofoed-Enevoldsen,A. (Am Heart J, 2004)