[1] Queens Med Ctr, Dept Neurosurg, Derby Rd, Nottingham NG7 2UH, England
[2] Univ Edinburgh, Translat Neurosurg, Ctr Clin Brain Sci, Edinburgh, Midlothian, Scotland
[3] Royal Victoria Infirm, Dept Neurosurg, Newcastle, England
[4] Univ Cambridge, Div Neurosurg, Dept Clin Neurosci, Addenbrookes Hosp, Cambridge, England
[5] Surg Theme Cambridge Clin Trials Unit, Cambridge Biomed Campus, Cambridge, England