1. Department of Clinical Science and Education, Sjukhusbacken 10, Södersjukhuset, Karolinska Institutet, Stockholm 171 77, Sweden
2. Division of Emergency Medicine, Private Bag X1, Matieland, Stellenbosch University, Stellenbosch, Western Cape 7602, South Africa
3. School of Public Health and Preventative Medicine, 553 St Kilda Road, Monash University, Melbourne, VIC 3800, Australia
4. Department of Emergency Medicine and Services, Topeliuksenkatu 5, Helsinki University Hospital, Helsinki 00280, Finland
5. Division of Emergency Medicine, Private Bag X3, Rondebosch, University of Cape Town, Cape Town 7700, South Africa
6. Department of Neurobiology, Care Sciences and Society, Section of Nursing, Nobels väg 5, Solna, Karolinska Institutet, Stockholm 171 77, Sweden
7. Academic EMS, Sjukhusbacken 10, Södersjukhuset, Karolinska Institutet, Stockholm 171 77, Sweden