1. From the Department of Neurosurgery (M.V., L.V.V., C.C., T.P.S., A.H., H.C.), RWTH Aachen University Hospital, Germany; Department of Neurosurgery (T.R.), Neuromed Campus, Kepler University Hospital, Linz, Austria; Department of Neurosurgery (R.H.), Maastricht University, Maastricht University Medical Center+, the Netherlands; Department of Neurosurgery (M. Weiss), Kantonsspital Aarau, Switzerland; Department of Neurosurgery (J.O.S., M.K., J.S., M.N., R.R.), University of Helsinki and Helsinki...