1. Medical University of Vienna, Austria (D.Z.).
2. Oslo University Hospital, Norway (A.E.F.).
3. Royal Perth Hospital, Perth, Australia (R.L.).
4. Papworth Hospital NHS Foundation Trust, Cambridge, United Kingdom (S.T.).
5. St Vincent’s Clinic, Sydney, Australia (P.J.).
6. Royal Brompton and Harefield Hospital, London, United Kingdom (A.S.).
7. Freeman Hospital, Newcastle upon Tyne, United Kingdom (S.S.).
8. University Heart Center Leipzig, Germany (M.S.).
9. Hannover Medical School, Germany (J.D.S.).