1. From the Department of Cardiovascular Medicine, Oakland University William Beaumont School of Medicine, Royal Oak, MI (D.E.H.); Medtronic, Inc, Minneapolis, MN (M.T.S., N.D.B., N.K., L.R.L., N.M.R., J.F.U.); Centre Medico-Chirugical, Le Chesnay, France (F.H.); Heart Center Bad Neustadt, Germany (T.D.); and Department of Radiology, University of Pittsburgh, Pittsburgh, PA (E.K.).