1 Department of NeurosurgeryUniversity Hospital Essen, University of Essen-Duisburg, Hufelandstrasse 55, 45147 Essen, GermanyDepartment of NeurosurgeryHospital of Cologne-Merheim, Cologne, GermanyDepartment of EndocrinologyUniversity of Essen-Duisburg, Essen, GermanyDepartment of NeurosurgeryUniversity of Erlangen-Nuremberg, Erlangen, GermanyDepartment of NeurosurgeryUniversity of Tuebingen, Tuebingen, Germany ilonka.kreitschmann@uk-essen.de.
2 Department of NeurosurgeryUniversity Hospital Essen, University of Essen-Duisburg, Hufelandstrasse 55, 45147 Essen, GermanyDepartment of NeurosurgeryHospital of Cologne-Merheim, Cologne, GermanyDepartment of EndocrinologyUniversity of Essen-Duisburg, Essen, GermanyDepartment of NeurosurgeryUniversity of Erlangen-Nuremberg, Erlangen, GermanyDepartment of NeurosurgeryUniversity of Tuebingen, Tuebingen, Germany.
3 Department of NeurosurgeryUniversity Hospital Essen, University of Essen-Duisburg, Hufelandstrasse 55, 45147 Essen, GermanyDepartment of NeurosurgeryHospital of Cologne-Merheim, Cologne, GermanyDepartment of EndocrinologyUniversity of Essen-Duisburg, Essen, GermanyDepartment of NeurosurgeryUniversity of Erlangen-Nuremberg, Erlangen, GermanyDepartment of NeurosurgeryUniversity of Tuebingen, Tuebingen, Germany Department of NeurosurgeryUniversity Hospital Essen, University of Essen-Duisburg, Hufelandstrasse 55, 45147 Essen, GermanyDepartment of NeurosurgeryHospital of Cologne-Merheim, Cologne, GermanyDepartment of EndocrinologyUniversity of Essen-Duisburg, Essen, GermanyDepartment of NeurosurgeryUniversity of Erlangen-Nuremberg, Erlangen, GermanyDepartment of NeurosurgeryUniversity of Tuebingen, Tuebingen, Germany.