1. From the Department of Cardiology (U.K., R.B., G.K., H.A.K., W.R.), University Hospital Heidelberg, Heidelberg, Germany; Department of Cardiology (J.K.), Limburg Hospital, Limburg, Germany; Department of Cardiac and Thoracic Surgery (K.K.), University Hospital Heidelberg, Heidelberg, Germany; and Medtronic, Inc (B.J.R.), Minneapolis, Minn.