1. From the Department of Internal Medicine and the Veteran’s Administration Medical Center (T.K.C., A.H., A.L.B., G.I., F.G.R., B.N., N.L.W.) and Department of Surgery (S.R.), University of Cincinnati College of Medicine, Ohio; and Department of Emergency Medicine (L.L.S., G.M.D., S.A.R.-M., E.W.D.), University of Iowa Carver College of Medicine, Iowa City.