1. Department of Cardiology, Bern University Hospital, Switzerland (L.H., T.P.).
2. AMIS Plus Data Center, Epidemiology, Biostatistics and Prevention Institute, University of Zurich, Switzerland (D.R.).
3. Division of Cardiology, University Hospital Basel, Switzerland (R.J.).
4. Department of Cardiology, Cardiocentro Ticino, Lugano, Switzerland (G.P.).
5. Heart Centre Lucerne, Luzerner Kantonsspital, Switzerland (F.C.).
6. Cardiology Department, La Tour Hospital, Geneva, Switzerland (P.U.).
7. Department of Biomedicine, University of Basel, Switzerland (P.E.).
8. Department of Cardiology, Kantonsspital St. Gallen, Switzerland (H.R.).