1. Hospital General Universitari Vall d’Hebron, CIBER-CV, Barcelona, Spain (A.E.).
2. Massachusetts General Hospital, Boston (E.M.I.).
3. University of Salerno, Italy (E.B.).
4. University of Pittsburgh, PA (T.G.G.).
5. University of Bologna, Italy (M.D.E.).
6. Robert-Bosch Krankenhaus, Stuttgart, Germany (U.S.).
7. University of Vienna, Austria (M.P.E.).
8. IRCCS Policlinico San Donato, Italy (S.T.).
9. Washington University School of Medicine, St. Louis, MO (A.C.B.).
10. Tromso University Hospital, Norway (T.M.).
11. Minneapolis Heart Institute, MN (K.M.H.).
12. University of Calgary Medical Centre, Alberta, Canada (S.H.).
13. Brigham and Women’s Hospital, Boston, MA (P.O’G.).
14. University of Leicester, United Kingdom (T.S.).
15. The Royal Brompton & Harefield NHS Foundation Trust, London, United Kingdom (C.A.N.).
16. University of Michigan, Ann Arbor (K.A.E.).