1 Department of Anaesthesiology, Oslo University Hospital, Norway; Norwegian National Advisory Unit on Prehospital Emergency Medicine (NAKOS) and Department of Anaesthesiology, Oslo University Hospital, Oslo, Norway. Electronic address: t.m.olasveengen@medisin.uio.no.
2 Department of Anaesthesiology, Oslo University Hospital, Norway; Emeritus Professor of Health Technology Assessment, Edinburgh University, UK.
3 Department of Anaesthesiology, Oslo University Hospital, Norway; Norwegian National Advisory Unit on Prehospital Emergency Medicine (NAKOS), Oslo University Hospital and University of Oslo, Oslo, Norway.