1 University Hospital Schleswig-Holstein, Institute for Emergency Medicine, Kiel, Germany; University Hospital Schleswig-Holstein, Department of Anaesthesiology and Intensive Care Medicine, Kiel, Germany. Electronic address: seewald@reanimationsregister.de.
2 University Hospital Schleswig-Holstein, Institute for Emergency Medicine, Kiel, Germany.
3 Copenhagen Emergency Medical Services, Copenhagen, Denmark; Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark.
4 The Danish Resuscitation Council and Resuscitation Academy Denmark, Denmark.