1. School of Medicine, University of Aberdeen, Aberdeen, United Kingdom
2. School of Medicine, University of Dundee, Ninewells Hospital and Medical School, Dundee, United Kingdom
3. Department of Neurosurgery, Ninewells Hospital and Medical School, Dundee, United Kingdom
4. Glasgow Neuro Society, Wolfson School of Medicine, University of Glasgow, Scotland, United Kingdom
5. Department of Neurosurgery, Aberdeen Royal Infirmary, NHS Grampian, Aberdeen, Scotland