1. From the Department of Anesthesiology and Intensive Care (M.F., M.B.S.), Helsinki University Hospital, University of Helsinki, Finland
2. Department of Emergency Care and Services (M.B.S.), Helsinki University Hospital, University of Helsinki, Finland
3. Department of Anesthesiology and Intensive Care, Kuopio University Hospital, Finland (M.R., S.B.).
4. Department of Neurology (S.C., G.S., N.M.-M.), Helsinki University Hospital, University of Helsinki, Finland
5. Department of Neurosurgery (R.R.), Helsinki University Hospital, University of Helsinki, Finland