[1] Trondheim Reg & Univ Hosp, Dept Neurol, Trondheim, Norway
[2] Trondheim Reg & Univ Hosp, Clin Neurophysiol, Trondheim, Norway
[3] SU, Sahlgrenska Hosp, Inst Clin Neurosci, Gothenburg, Sweden
[4] Oulu Univ Hosp, Dept Neurol, Oulu, Finland
[5] Univ Ulm, Dept Neurol, Ulm, Germany
[6] Danube Univ, Krems, Austria
[7] Colentina Clin Hosp Bucharest, Neurol, Bucharest, Romania