1. Cardiovascular Research Institute Basel and Department of Cardiology (P.B., J.B., R.T., T.N., K.W., D.W., J.S., C.P., M.R.G., N.K., J.d.F.d.L., S.E.C., E.P., T.R., C.M.)
2. GREAT Network, Rome, Italy (P.B., J.B., R.T., T.N., K.W., D.W., J.S., C.P., M.R.G., N.K., J.d.F.d.L., O.M., B.L., F.J.M.-S., B.M., T.R., C.M.).
3. Department of Internal Medicine (J.B., M.R.G., E.P.)
4. Department of General and Interventional Cardiology, Hamburg University Heart Center, Germany (R.T.).
5. Laboratory Medicine (K.R.), University Hospital Basel, University of Basel, Switzerland.
6. Emergency Department, Hospital Clinic, Barcelona, Spain (O.M., B.L.).
7. Servicio de Urgencias, Hospital Clínico San Carlos, Madrid, Spain (F.J.M.-S.).
8. Second Department of Cardiology, Medical University of Silesia, Zabrze, Poland (B.M., P.M.).
9. Emergency Department, University Hospital Zurich, Switzerland (D.I.K.).