[1] Univ Vienna, Inst Neurol, A-1097 Vienna, Austria
[2] Univ Vienna, Dept Neurosurg, A-1010 Vienna, Austria
[3] Univ Vienna, Dept Clin Pathol, A-1010 Vienna, Austria
[4] Ludwig Boltzmann Inst Clin Neurobiol, Vienna, Austria
[5] Neurol Hosp Maria Theresien Schlossel, Vienna, Austria
[6] Landesnervenklin, Salzburg, Austria