1. The Geisel School of Medicine at Dartmouth, Hanover, NH (E.P.Z.).
2. Division of Cardiology, Dartmouth-Hitchcock Medical Center, The Dartmouth Institute, Lebanon, NH (E.P.Z.).
3. University of Washington Medical Center, Seattle (J.E.P.).
4. Department of Cardiology, Smidt Heart Institute, Cedars-Sinai Hospital, Los Angeles, CA (C.M.A., R.K.S.).
5. Duke Clinical Research Institute, Duke University Medical Center, Durham, NC (S.M.A.-K.).
6. Mayo Clinic, St Mary’s Campus, Rochester, MN (F.A.-A., Y.-M.C.).
7. UC San Diego Health, La Jolla, CA (U.B.-G.).
8. Cleveland Clinic, Cleveland, OH (M.K.C., E.S.).
9. Department of Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo General Medical Center, NY (A.B.C.).
10. North Texas Heart Center, Dallas, TX (J.L.H.).
11. Department of Internal Medicine, Section of Cardiovascular Medicine, Yale School of Medicine, New Haven, CT (R.L.).
12. Division of Cardiology, Cooper Medical School of Rowan University, Camden, NJ (F.S., A.M.R.).
13. Texas Cardiac Arrhythmia Institute, Austin, TX (K.P.T.).
14. Division of Cardiology, Department of Internal Medicine, Rush University, Chicago, IL (A.S.V.).
15. Department of Medicine, Division of Cardiovascular Medicine, University of Wisconsin School of Medicine and Public Health, Madison, WI (J.M.W.).