1. Department for Medicine; Center for Resuscitation Science; Karolinska Institutet; Stockholm Sweden
2. Emergency Medical Services Copenhagen; University of Copenhagen; Copenhagen Denmark
3. Department of Clinical Sciences; Danderyd University Hospital; Karolinska Institutet; Stockholm Sweden
4. Department of Cardiology; Copenhagen University Hospital Gentofte; Hellerup Denmark
5. Department of Cardiology; Heart Center; Academic Medical Center; Amsterdam The Netherlands
6. Institute of Internal Medicine; Department of Metabolism and Cardiovascular Research; Sahlgrenska University Hospital; Gothenburg Sweden
7. Norwegian National Advisory Unit on Prehospital Emergency Medicine (NAKOS); Air Ambulance Department; Oslo Norway
8. Department of Anaesthesiology Oslo University Hospital and University of Oslo; Oslo Norway