[1] Lausanne Univ Hosp CHUV, Dept Clin Neurosci, Serv Neurosurg, 46 Rue Bugnon, CH-1011 Lausanne, Switzerland
[2] Univ Bern, Inselspital, Dept Neurosurg, Bern, Switzerland
[3] Basel Univ Hosp, Dept Neurosurg, Basel, Switzerland
[4] Basel Univ Hosp, Dept Radiol, Diagnost & Intervent Neuroradiol Sect, Basel, Switzerland
[5] Univ Zurich, Univ Hosp Zurich, Dept Neurosurg, Zurich, Switzerland
[6] Univ Zurich, Clin Neurosci Ctr, Zurich, Switzerland
[7] Univ Hosp Gottingen, Dept Neurosurg, Gottingen, Germany
[8] Univ Freiburg, Med Ctr, Dept Neurosurg, Freiburg, Germany
[9] Osped Civ Lugano, Dept Neurosurg, Lugano, Switzerland
[10] Kantonsspital St Gallen, Dept Neurosurg, St Gallen, Switzerland
[11] Baylor Med Ctr & Coll Med, Dept Neurosurg, Houston, TX USA
[12] Kantonsspital Aarau, Dept Neurosurg, Aarau, Switzerland
[13] Kantonsspital Aarau, Dept Radiol, Div Diagnost & Intervent Neuroradiol, Aarau, Switzerland
[14] Geneva Univ Hosp HUG, Dept Radiol, Div Diagnost & Intervent Neuroradiol, Geneva, Switzerland
[15] Univ Bern, Inselspital, Dept Radiol, Div Diagnost & Intervent Neuroradiol, Bern, Switzerland
[16] Hop Univ Geneve, Dept Neurosurg, Geneva, Switzerland
[17] Lausanne Univ Hosp CHUV, Dept Radiol, Div Diagnost & Intervent Neuroradiol, Lausanne, Switzerland
[18] Lausanne Univ Hosp CHUV, Lausanne Inst Clin Epidemiol & Biostat, Lausanne, Switzerland
[19] Univ Lausanne UniL, Lausanne, Switzerland