1. Department of Neurosurgery, University Hospitals North Midlands, Newcastle-under-Lyme, UK
2. Department of Neurosurgery, Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK
3. Clinical Fellow, General Medical Council, London, UK
4. Institute of Inflammation and Ageing, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
5. Department of Neurosurgery, University Hospitals Coventry Warwickshire, Coventry, UK
6. Department of Neurosurgery, Nottingham University Hospitals NHS Trust, Nottingham, UK