[1] Helsinki Univ Hosp, Dept Neurol, Helsinki, Finland
[2] Helsinki Univ Hosp, Dept Neurosurg, Helsinki, Finland
[3] Kuopio Univ Hosp, Epilepsy Ctr, NeuroCtr, Kuopio, Finland
[4] Kuopio Univ Hosp, Dept Neurol, NeuroCtr, Kuopio, Finland
[5] Kuopio Univ Hosp, Dept Neurosurg, NeuroCtr, Kuopio, Finland
[6] Oulu Univ Hosp, Dept Neurol, Oulu, Finland
[7] Tampere Univ Hosp, Dept Neurol, Tampere, Finland
[8] Turku Univ Hosp, Div Clin Neurosci, Turku, Finland
[9] Turku Univ Hosp, Dept Neurosurg, Turku, Finland
[10] Helsinki & Uusimaa Hosp Dist HUS, Data Adm, Helsinki, Finland