1Department of Clinical Neurosciences, University of Cambridge, Cambridge, Biomedical Campus, Cambridge, CB2 0QQ UK
2Division of Neurosurgery, Addenbrooke’s Hospital, Box 167, Cambridge, CB2 0QQ UK
3Department of Clinical Neuroscience, Karolinska Institute, Stockholm, Sweden
4Wessex Neurological Centre, University Hospital Southampton NHS Foundation Trust, Tremona Rd, Southampton, Hampshire, SO16 6YD UK
5Institute of Neurosciences, Queen Elizabeth University Hospital, 1345 Govan Road, Glasgow, UK
6Department of Neurosurgery, Sheffield Teaching Hospitals NHS Trust, Royal Hallamshire Hospital, Glossop Road, Sheffield, S10 2JF UK
7Department of Neurosurgery, Leeds General Infirmary, Great George Street, Leeds, LS1 3EX UK
8Southwest Neurosurgical Centre, Plymouth University Hospitals NHS trust, Plymouth, PL6 8DH UK
9Cambridge Clinical Trials Unit (CCTU), Coton House, Level 6, Cambridge Biomedical Campus, Box 401, Cambridge, CB2 0QQ UK
10Norwich Medical School, University of East Anglia, Norwich, NR4 7TJ UK
11Imperial College Healthcare NHS Trust, South Kensington Campus, London, SW7 2AZ UK
12Royal London Hospital, Barts Health NHS trust, Whitechapel Road, London, E1 1BB UK
13Department of Clinical Neurosciences, University of Edinburgh, Western General Hospitals NHS Trust, Crewe Road, Edinburgh, EH4 2XU UK
14NIHR Surgical Reconstruction and Microbiology Research Centre & University Hospitals Birmingham NHS Foundation Trust, School of Clinical and Experimental Medicine, University of Birmingham, Institute of Biomedical Research (West), Room WX 2.61, Edgbaston, Birmingham, B15 2TT UK
15MRC Biostatistics Unit, Robinson Way, Cambridge Biomedical Campus, Cambridge, CB2 0SR UK
16Clinical Trials Pharmacy, Addenbrooke’s Hospital, Cambridge Biomedical Campus, Cambridge, CB2 0QQ UK