[1] Oxford Univ Hosp NHS Fdn Trust, Dept Neurosurg, Oxford, England
[2] Charles Univ Prague, Cent Mil Hosp, Med Fac 1, Dept Neurosurg & Neurooncol, Prague, Czech Republic
[3] Haaglanden Med Ctr, Dept Neurosurg, The Hague, Netherlands
[4] Leiden Univ, Med Ctr, Leiden, Netherlands
[5] Massachusetts Gen Hosp, Dept Neurol, Boston, MA 02114 USA
[6] Fdn IRCCS Policlin San Matteo, Dept Neurosurg, Pavia, Italy
[7] Dar Al Shifa Hosp, Dept Neurosurg, Kuwait, Kuwait
[8] Univ Hosp Muenster, Dept Neurosurg, Munster, Germany
[9] Istanbul Medeniyet Univ, Dept Neurosurg, Goztepe Educ & Res Hosp, Istanbul, Turkey
[10] Paras Hosp, Dept Neurosurg, Udaipur, Rajasthan, India
[11] Paracelsus Klin, Dept Neurosurg, Osnabruck, Germany
[12] Rhein Westfal TH Aachen, Dept Neurosurg, Aachen, Germany