1. From the Department of Cardiology (P.A.S., D.T., R.B., J.Z., H.A.K.), Medical University Hospital Heidelberg, Heidelberg, Germany; Institute for Physiology and Pathophysiology (N.D., A.D., C.B.), University of Heidelberg, Heidelberg, Germany; and the Department of Molecular Neurobiology (P.A.S., M.K.), Max-Planck-Institute for Medical Research, Heidelberg, Germany.