1. Department of Neurosurgery, Antwerp University Hospital, Antwerp, Belgium
2. Faculty of Medicine & Health Sciences, University of Antwerp, Antwerp, 2650, Belgium
3. Faculty of Medicine & Life Science, Hasselt University, Hasselt, 3500, Belgium
4. Studie- & opleidingcentrum Neurochirurgie Virga Jesse, Hasselt, 3500, Belgium
5. Department of Neurosurgery Jessa Hospital, Hasselt, 3500, Belgium
6. Department of Neurosurgery St. Trudo Hospital, Sint-Truiden, 3800, Belgium
7. Department of Neurosurgery St. Franciscus Hospital, Heusden-Zolder, 3550, Belgium
8. Department of Surgical Sciences, Section of Neurosurgery, Dunedin School of Medicine, University of Otago, Dunedin, 9016, New Zealand