1. Division of Cardiology, Rush University Medical Center, Chicago, IL (P.S.S.).
2. Geisinger Heart Institute, Wilkes-Barre, PA (A.N., T.D.B., P.V.).
3. Division of Cardiology, Chinese University of Hong Kong, (J.Y.S.C.).
4. Division of Cardiology, Imperial College London, United Kingdom (A.D.A., Z.I.W.).
5. Department of Cardiology, Virginia Commonwealth University Health System, Richmond (K.A.E.).