[1] Kantonsspital St Gallen, Dept Neurosurg, St Gallen, Switzerland
[2] Univ Geneva, Dept Basic Neurosci, Geneva, Switzerland
[3] Kantonsspital St Gallen, Dept Med Oncol & Hematol, St Gallen, Switzerland
[4] Kantonsspital St Gallen, Dept Radiol & Nucl Med, St Gallen, Switzerland
[5] Kantonsspital St Gallen, Dept Neurol, St Gallen, Switzerland
[6] Natl Hosp Neurol & Neurosurg, UCL Queen Sq Inst Neurol, Dept Clin & Movement Neurosci, London, England
[7] Med Ctr Univ Freiburg, Dept Stereotact & Funct Neurosurg, Freiburg, Germany