1. From the Departments of Emergency Medicine (D.O., M.J.H.), Cardiothoracic Surgery and Anesthesiology (U.S.), and Cardiology (F.B.), Karolinska University Hospital, Stockholm, Sweden; and Departments of Medicine (D.O., F.B., M.J.H) and Molecular Medicine and Surgery (U.S.), Karolinska Institutet, Stockholm, Sweden.