1. From the Heart Rhythm Institute (A.I., H.N., T.S., R.L., W.M.J.) and Department of Pathology, Veterans Administration Medical Center (J.V.P.), University of Oklahoma Health Sciences Center, Oklahoma City; St. Jude Medical GVA, Geneva, Switzerland (H.L., E.F., A.Y.); and University of Geneva, Geneva, Switzerland (D.C.S.).