1. The Kansas City Heart Rhythm Institute and Research Foundation, Overland Park, KS (D.R.L., R.G.).
2. Heart, Vascular, and Thoracic Institute and Lerner Research Institute, Cleveland Clinic, OH (M.K.C.).
3. University of Washington, Seattle (K.K.P.).
4. Center for Cardiovascular Analytics, Research and Data Science, Providence Heart Institute, Providence St Joseph Health, Portland, OR (T.J.G.).
5. Mt Sinai School of Medicine, New York, NY (M.T.).
6. Weill Cornell School of Medicine, New York, NY (J.C.).
7. Ascension Health System, Indianapolis, IN (P.P.).
8. Centro Cardiovascular, San Juan, PR (J.S.).
9. Yale School of Medicine, Hartford, CT (R.L.).
10. VA Greater Los Angeles Healthcare System and David Geffen School of Medicine at University of California, Los Angeles (J.K.H.).
11. Prairie Heart Institute, Springfield, IL (B.R.).
12. University of Wisconsin, Madison (L.E., M.L.).
13. University of Texas Southwestern, Dallas (J.J.).
14. Bethel University, St Paul, MN (K.S.).
15. Mason City Clinic, IA (B.O.).
16. Columbia University Medical Center, New York, NY (E.W.).
17. Mayo Clinic, Rochester, MN (P.A.N.).
18. Metro Health Medical Center, Cleveland, OH (E.K.).
19. University of Minnesota School of Medicine, Minneapolis (A.G.).
20. Johns Hopkins School of Medicine, Baltimore, MD (J.M.M.).
21. Stanford University, Palo Alto, CA (P.J.W.).
22. Cooper Medical School of Rowan University, Camden, NJ (A.M.R.).