1. From the Department of Cardiology, Copenhagen University Hospital, Gentofte, Denmark (F.F., G.H.G., P.W., M.L.H., E.L.F., S.S.A., C.T.-P.); Emergency Medicine and Emergency Medical Services, Capital Region of Denmark (F.K.L.); Mobile Emergency Care Unit of Copenhagen, Capital Region of Denmark (S.L.N.); National Institute of Public Health, Copenhagen, Denmark (S.R.); and Department of Cardiology, Copenhagen University Hospital, Rigshospitalet, Denmark (T.K.S., L.K.).