Online Appendix for the following March 15 JACC article TITLE: Echocardiographic Findings in Patients Meeting Task Force Criteria for Arrhythmogenic Right Ventricular Dysplasia: New Insights From the Multicenter Study of Right Ventricular Dysplasia AUTHORS: Danita M. Yoerger, MD, Cardiac Ultrasound Laboratory, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, Frank Marcus, MD, University of Arizona, Tucson, Arizona, Duane Sherrill, PhD, University of Arizona, Tucson, Arizona, Hugh Calkins, MD, Johns Hopkins University, Baltimore, Maryland, Jeffery A. Towbin, MD, Baylor College of Medicine, Houston, Texas, Wojciech Zareba, MD, PhD, University of Rochester, Rochester, New York, Michael H. Picard, MD, Cardiac Ultrasound Laboratory, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, for the Multidisciplinary Study of Right Ventricular Dysplasia Investigators APPENDIX Enrolling physicians: David Cannom, MD (Los Angeles Cardiology Associates)*, Melvin Scheinman, MD (University of California at San Francisco)*, Jack McAnulty, MD (Oregon Health and Science University)†, David Wilber, MD (Loyola University Medical Center)*, Robert Myerburg, MD (University of Miami School of Medicine)†, Hugh Calkins, MD (Johns Hopkins Hospital)*, James Daubert, MD (University of Rochester)*, Mark Estes, III, MD (Tufts-New England Medical Center)*, Michael Sweeney, MD (Brigham and Women’s Hospital)*, Leslie Miller, MD (University of Minnesota)*, Arthur Easley (University of Colorado HSC)†, Hasan Garan, MD (New York Presbyterian Medical Center)†, Bruce Lerman (New York Hospital Cornell Medical Center)†, Jonathan Steinberg (St. Luke’s-Roosevelt Hospital Center)†, Mohamed Hamdan (University of Texas Southwestern Medical Center)†, Angel Leon (Emory Crawford Long Hospital)†, Marcus Wharton (Medical University of South Carolina Heart Center)†, Andrew Krahn, MD(London Health Sciences Center-University Campus)†, Henry Duff (University of Calgary HSC)*, Charles Kerr (St. Paul’s Hospital)†, and Mario Talajic (Montreal Heart Institute)*. *Centers enrolling patients in this study; †Centers participating in this study.