1. From the Department of Cardiovascular Surgery and Transplantology (K.B., B.K., J.S.) and Pathomorphology (W.S.), Jagiellonian University, John Paul II Hospital, Krakow, Poland; Cardiology and Cardiac Electrophysiology, St Mary’s Medical Center, San Francisco, CA (R.L.M., R.J.L.); and Cardiovascular Research Institute, Department of Medicine, and Institute for Regeneration Medicine, University of California, San Francisco (R.J.L.).