[1] Univ Hosp Basel, Dept Neurosurg, Spitalstr 21, CH-4031 Basel, Switzerland
[2] Univ Basel, Fac Med, Klingelbergstr 61, CH-4056 Basel, Switzerland
[3] Univ Basel, Univ Hosp Basel, Dept Neurol, Petersgraben 4, CH-4031 Basel, Switzerland
[4] Reha Rheinfelden, Salinenstr 98, CH-4310 Rheinfelden, Switzerland
[5] Univ Basel Hosp, Div Oncol, CH-4031 Basel, Switzerland
[6] BioFocus, CH-4123 Allschwil, Switzerland
[7] Reg Hosp Lugano, Neuroctr Southern Switzerland, Dept Neurosurg, Via Tesserete 46, CH-6900 Lugano, Switzerland
[8] Kantonsspital Aarau, Dept Neurosurg, Tellstr 25, CH-5001 Aarau, Switzerland
[9] Univ Hosp Geneva, Dept Anaesthesiol, Geneva, Switzerland
[10] Univ Lausanne Hosp CHUV, Dept Neurosurg, Rue Bugnon 46, CH-1011 Lausanne, Switzerland
[11] Univ Hosp Bern, Dept Neurosurg, Freiburgstr 10, CH-3010 Bern, Switzerland
[12] Univ Zurich, Univ Zurich Hosp, Dept Neurosurg, Clin Neurosci Ctr, CH-8091 Zurich, Switzerland
[13] Kantonsspital Graubunden, Loestr 170, CH-7000 Chur, Switzerland
[14] Univ Hosp Basel, Multiple Sclerosis Ctr, Res Ctr Clin Neuroimmunol & Neurosci RC2NB, Dept Biomed & Clin Res,Neurol, Basel, Switzerland
[15] Kantonsspital Winterthur, Dept Neurosurg, Brunngasse 30, CH-8401 Winterthur, Switzerland
[16] Univ Svizzera Italiana USI, Fac Biomed Sci, Via Giuseppe Buffi 13, CH-6900 Lugano, Switzerland
[17] Valais Hosp, Dept Gynecol & Obstet, Ave Grand Champsec 80, CH-1951 Sion, Switzerland
[18] Klin Hirslanden, Witellikerstr 40, CH-8008 Zurich, Switzerland
[19] Kantonsspital St Gallen, Dept Neurosurg, Rorschacherstr 95, CH-9007 St Gallen, Switzerland