1. Department of Molecular Physiology and Biophysics, University of Vermont, Larner College of Medicine, Burlington (M.J.P., T.S.O., B.M.P., M.L.).
2. Division of Cardiovascular Medicine and the Penn Cardiovascular Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia (M.P.M., J.M.Y., C.P., M.-S.K., K.B.M., Z.A., D.P.K., S.M.D.).
3. Department of Cardiothoracic Surgery, University of Michigan School of Medicine, Ann Arbor (F.D.P.).