[1] Kings Coll Hosp London, Dept Neurosurg, London, England
[2] St George Hosp, Dept Neurosurg, London, England
[3] Natl Hosp Neurol & Neurosurg, Dept Neurosurg, Queen Sq, London, England
[4] Nottingham Univ Hosp, Queens Med Ctr, Dept Neurosurg, Nottingham, England
[5] Univ Hosp Southampton, Wessex Neurol Ctr, Dept Neurosurg, Southampton, Hants, England
[6] Walton Ctr, Dept Neurosurg, Liverpool, Merseyside, England
[7] Queen Elizabeth Univ Hosp, Dept Neurosurg, Glasgow, Lanark, Scotland
[8] Addenbrookes Hosp, Div Neurosurg, Cambridge, England
[9] Oxford Univ Hosp, Dept Neurosurg, Oxford, England
[10] Salford Royal Hosp, Dept Neurosurg, Manchester, Lancs, England
[11] Univ Edinburgh, Ctr Clin Brain Sci, Translat Neurosurg, Edinburgh, Midlothian, Scotland
[12] Guys & St Thomas Hosp NHS Fdn Trust, London, England
[13] Kings Coll London, Dept Primary Care & Publ Hlth Sci, London, England