1. Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden
2. Department of Neurosurgery, Region Östergötland, Östergötland, Sweden
3. Department of Neurology, Region Östergötland, Östergötland, Sweden
4. Department of Neurosurgery, Region Örebro Län, Örebro Län, Sweden
5. Department of Neurosurgery, Gui de Chauliac Hospital, Montpellier University Medical Center, Montpellier, France