1. From the Institut für Prophylaxe der Kreislaufkrankheiten (P.v.H., K.S.C.W., C.W.) and Medizinische Poliklinik (P.J.N., C.W.), Ludwig-Maximilians-Universität, Munich, Germany; the Department of Biomedical Engineering (Y.H., K.L.), University of Virginia, Charlottesville; and the Serono Pharmaceutical Research Institute (A.E.I.P.), Geneva, Switzerland.