[1] Univ Med Ulm, Dept Neurosurg, Peripheral Nerve Unit, Gunzburg, Germany
[2] Asklepios Childrens Hosp, Pediat Neurosurg, St Augustin, Germany
[3] Heidelberg Univ Hosp, Dept Neurosurg, Heidelberg, Germany
[4] Univ Hosp Regensburg, Dept Neurol, Regensburg, Germany
[5] Univ Hosp Regensburg, Wilhelm Sander Neuro Oncol Unit, Regensburg, Germany
[6] Univ Hosp Cologne, Ctr Neurosurg, Cologne, Germany