1. Holbaek Hospital, University of Copenhagen; Department of Emergency Medicine; Holbaek Denmark 4300
2. Rigshospitalet, University of Copenhagen; Department of Anaesthesia, Centre of Head and Orthopaedics; Blegdamsvej 9 Copenhagen Copenhagen Denmark 2100
3. Copenhagen Trial Unit, Centre for Clinical Intervention Research, Department 7812, Rigshospitalet, Copenhagen University Hospital; The Cochrane Hepato-Biliary Group; Blegdamsvej 9 Copenhagen Sjaelland Denmark DK-2100
4. Holbaek Hospital; Department of Cardiology; Holbaek Denmark 4300