1. Cleveland Clinic, OH (N.V., J.D.E., R.M., R.E.R.).
2. Medical University of Lodz, Poland (I.C.).
3. Stanford University, Palo Alto, CA (M.P.T.).
4. Antwerp University and University Hospital, Belgium (H.H.).
5. Taipei Veterans General Hospital, Taiwan (Y.-F.H.).
6. University of Minnesota, Minneapolis (L.Y.C.).
7. University of Rochester, NY (J.-P.C., A.P., J.S.S.).
8. Temple University, Philadelphia, PA (E.M.C.).
9. Hasselt University, Belgium (L.G.).
10. University of Liverpool, United Kingdom (D.A.L.).
11. Northwestern University Feinberg School of Medicine, Chicago, IL (R. Passman).
12. Duke University, Durham, NC (J.P.P.).
13. National Institute of Cardiology, Warsaw, Poland (E.P., R. Piotrowicz).
14. Lund University, Sweden (P.G.P.).
15. Faculdade de Medicina, Centro de Telessaúde, Hospital das Clínicas, and Departamento de Clínica Médica, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil (A.L.R.).
16. Cooper Medical School of Rowan University, Camden, NJ (A.M.R.).
17. Cardiology Division, New York-Presbyterian Queens, NY (D.S.).
18. Karolinska University Hospital, Stockholm, Sweden (E.S.).