1. Section of Cardiovascular Medicine, Department of Medicine, Boston University School of Medicine/Boston Medical Center, Boston, MA (F.L.R.).
2. Cardiac Performance Program, Harvard Medical School/Massachusetts General Hospital, Boston, MA (A.L.B.).
3. Division of Cardiology, Department of Medicine, Johns Hopkins University, Baltimore, MD (A.G.H.).
4. Cardiovascular Imaging Section, Harvard Medical School/Brigham and Women’s Hospital, Boston, MA (M.J.-H.).
5. Division of Cardiology, Department of Medicine, Weill Cornell Medicine/New York Presbyterian Hospital, New York, NY (J.K., J.W.W.).
6. Department of Radiology, University of Washington School of Medicine, Seattle, WA (K.G.O., G.R.).
7. Cardiovascular Division, Department of Medicine, University of Minnesota Medical School, Minneapolis, MN (C.S.).
8. Mallinckrodt Institute of Radiology, Washington University School of Medicine, Saint Louis, MO (P.K.W.).