[1] Turku Univ Hosp, Dept Neurosurg, Neuroctr, Turku, Finland
[2] Univ Turku, Clin Neurosci, Turku, Finland
[3] Univ Turku, Dept Surg, Turku, Finland
[4] Turku Univ Hosp, Dept Vasc Surg, Turku, Finland
[5] Turku Univ Hosp, Dept Radiol, Turku, Finland
[6] Univ Turku, Hameentie 11, Turku 20521, Finland
[7] Univ Tampere, Dept Radiol, Tampere, Finland
[8] Univ Turku, Dept Clin Med, Biostat, Turku, Finland
[9] Univ Turku, Dept Biostat, Turku, Finland
[10] Turku Univ Hosp, Turku, Finland
[11] Univ Helsinki, Dept Vasc Surg, Helsinki, Finland
[12] Helsinki Univ Hosp, Helsinki, Finland
[13] Satasairaala, Dept Surg, Pori, Finland