1. San Raffaele Hospital, Milan, Italy (P.V., P.D.B.)
2. University of Colorado, Aurora (W.S.T., W.H.S.)
3. University of Chicago Medical Center, IL (R.T.).
4. University Centre for Statistics in the Biomedical Sciences, Vita-Salute San Raffaele University, Milano, Italy (C.B., A.N.)
5. UCLA Cardiac Arrhythmia Center, UCLA Health System, Los Angeles, CA (M.V., K.S.).
6. Perelman School of Medicine at the University of Pennsylvania, Philadelphia (D.S.F., P.S., D.C., F.M.).
7. Albert Einstein College of Medicine/Montefiore Medical Center, New York (L.D.B.).
8. Brigham and Women’s Hospital, Boston, MA (U.T.).
9. Baylor St Luke’s Medical Center/Texas Heart Institute, Houston (N.M.).
10. Dokkyo Medical University Koshigaya Hospital, Saitama, Japan (S.N.).
11. University of Minnesota Medical Center, Minneapolis VA Medical Center, Minneapolis (V.T.).
12. Intermountain Heart Institute, Intermountain Medical Center, Murray, UT (T.J.B., J.P.W.).
13. University of Maryland Medical Center, Baltimore (T.D.).
14. University of Kansas Medical Center, Kansas City (D.L.).
15. Texas Cardiac Arrhythmia Institute, St David’s Medical Center, Austin (J.D.B.).
16. Vanderbilt University Medical Center, Nashville, TN (W.G.S.).