[1] Univ Hosp Coventry & Amp Warwickshire, Dept Neurosurg, Coventry, W Midlands, England
[2] Royal Preston Hosp, Dept Neurosurg, Preston, Lancs, England
[3] Ninewells Hosp, Dept Neurosurg, Dundee, Scotland
[4] Med Sch, Dundee, Scotland
[5] Queens Hosp, Dept Neurosurg, Romford, Essex, England
[6] Royal Victoria Infirm, Dept Neurosurg, Newcastle Upon Tyne, Tyne & Wear, England
[7] Royal Hallamshire Hosp, Dept Neurosurg, Sheffield, S Yorkshire, England
[8] Southampton Univ Hosp NHS Fdn Trust, Tremona Rd, Southampton SO16 6YD, Hants, England