1. Institute of Pharmacology and Clinical Pharmacology, Medical Faculty, Heinrich-Heine-Universität Düsseldorf, Germany (A.M., J.W.F., M.G.).
2. Robert M. Berne Cardiovascular Research Center (J.C.G., J.M.H., D.B.H., V.O., C.M., M.A.M., C.A.M.), University of Virginia, Charlottesville.
3. Division of Cardiovascular Medicine, Department of Medicine (C.A.M.), University of Virginia, Charlottesville.