[1] Stockholm South Gen Hosp, Dept Emergency Med, Stockholm, Sweden
[2] Karolinska Inst, Dept Clin Sci & Educ Sodersjukhuset, Stockholm, Sweden
[3] Karolinska Inst, Dept Clin Neurosci, Stockholm, Sweden
[4] Univ Bologna, St Orsola Malpighi Hosp, Dept Cardiac Surg, Bologna, Italy
[5] San Raffaele Hosp Sci Inst, Dept Neurol, Milan, Italy
[6] Karolinska Univ Hosp, Dept Neurosurg, Stockholm, Sweden
[7] Karolinska Univ Hosp, Med Unit Neurol, Stockholm, Sweden
[8] Karolinska Univ Hosp, Dept Perioperat Med & Intens Care, Stockholm, Sweden