[1] EANS, Global & Humanitarian Neurosurg Comm, Leeds, W Yorkshire, England
[2] Leeds Gen Infirm, Dept Neurosurg, Leeds, W Yorkshire, England
[3] NHS Fdn Trust, Sheffield Teaching Hosp, Dept Neurosurg, Sheffield, S Yorkshire, England
[4] Sahlgrens Univ Hosp, Dept Neurosurg, Gothenburg, Sweden
[5] Univ Hosp Borgo Trento, Dept Neurosurg, Verona, Italy
[6] Hosp Del Mar, Spine Ctr, Barcelona, Spain
[7] Aristotle Univ Thessaloniki, AHEPA Univ Hosp, Med Sch, Dept Neurosurg, Thessaloniki, Greece
[8] Univ Cattolica Sacro Cuore, Inst Neurosurg, CVJ Surg Unit, Rome, Italy
[9] Univ Hosp Trauma, Dept Neurosurg, Tirana, Albania
[10] Gen Univ Hosp Alicante, Dept Neurosurg, Alicante, Spain
[11] Fed Neurosurg Ctr, Novosibirsk, Russia
[12] Univ Hosp Plymouth NHS Trust, Dept Neurosurg, Plymouth, Devon, England
[13] HMC HAGA The Hague, Univ Neurosurg Ctr Holland, The Hague, Netherlands
[14] LUMC Leiden, Leiden, Netherlands
[15] Univ Belgrade, Univ Clin Ctr Serbia, Fac Med, Clin Neurosurg, Belgrade, Serbia
[16] Royal Infirm, Dept Neurosurg, Edinburgh, Midlothian, Scotland