1. From the Departments of Cardiology (E.Z., E.S., S.L., C.K., D.T., S.K., F.N., J.K., H.A.K., W.S., C.A.K.) and Physiology and Pathophysiology (V.A.W.K.), University of Heidelberg Medical School, and Division of Toxicology and Cancer Risk Factors (R.W.O.), German Cancer Research Center, Heidelberg, Germany.