1. Department of Neurosurgery , Institute of Neurological Sciences, , Glasgow, UK
2. Queen Elizabeth University Hospital , Institute of Neurological Sciences, , Glasgow, UK
3. University of Glasgow , Glasgow, UK
4. Woodson Wohl Cancer Research Centre, Institute of Cancer Sciences, Garscube Estate , Glasgow, UK
5. Department of Clinical Oncology, Beatson West of Scotland Cancer Centre , Glasgow, UK
6. Laboratory Medicine Building, Queen Elizabeth University Hospital , Glasgow, UK