1. From the Department of Cardiology (C.J.T., H.R.A., L.T., J.F.L.) and Department of Clinical Epidemiology (S.P.J.), Aarhus University Hospital, Aarhus, Denmark; Department of Cardiology, Odense University Hospital, Odense, Denmark (L.O.J., P.T.); Department of Cardiology, Aalborg University Hospital, Aalborg, Denmark (H.H.T., J.R.); and Falck Emergency Medical Service, The Falck House, Copenhagen, Denmark (H.R.A.).