[1] Karolinska Inst, Dept Clin Neurosci, Sect Neurosurg, Stockholm, Sweden
[2] Karolinska Univ Hosp, Dept Neurosurg, Hotellet Plan 4, S-17176 Stockholm, Sweden
[3] Sahlgrens Acad, Inst Neurosci & Physiol, Dept Clin Neurosci, Gothenburg, Sweden
[4] Sahlgrens Univ Hosp, Dept Neurosurg, Blastraket 7, Plan 3, Sahl-grenska Universitetssj, S-41345 Gothenburg, Sweden
[5] Karolinska Univ Hosp, Dept Neuroradiol, ME Neuroradiol, S-17176 Stockholm, Sweden
[6] Karolinska Inst, Dept Clin Neurosci, Stockholm, Sweden
[7] Funktionsenhet Neuro Operat, Perioperativ Med och Intensivvard PMI, Karolinska, S-17176 Stockholm, Sweden
[8] Univ Minnesota Med Sch, Dept Chair, Neurosurg, D429 Mayo Mem Bldg, 420 Delaware St S E, MMC96, Minneapolis, MN 55455 USA
[9] Rigshospitalet, Dept Neurosurg, Copenhagen, Denmark
[10] Karolinska Univ Hosp, Dept Neurosurg, Hotellet Plan 4, S-17176 Stockholm, Sweden