1. Division of Cardiology, Columbia University Irving Medical Center (E.M.D.).
2. Department of Cardiology, Alfred Hospital, Melbourne, Australia (A.B.).
3. Department of Cardiology, Cleveland Clinic, Ohio (T.M., E.H.).
4. Northwestern University Feinberg School of Medicine (A.A.).
5. Division of Cardiovascular Medicine, Keck School of Medicine, University of Southern California (U.E.).
6. National Heart Centre Singapore and Duke-National University of Singapore (C.S.P.L.).