The Walton Centre NHS Foundation Trust - Department of Neurosurgery, University of Liverpool - Liverpool Clinical Trials Centre, Bangor University - Centre for Health Economics and Medicines Evaluation, University of Liverpool - Liverpool Clinical Trials Centre, University of Liverpool - Liverpool Clinical Trials Centre, University of Liverpool - Liverpool Clinical Trials Centre, University of Liverpool - Liverpool Clinical Trials Centre, Bangor University - Centre for Health Economics and Medicines Evaluation, The Walton Centre NHS Foundation Trust, The Walton Centre NHS Foundation Trust - Department of Neurosurgery, Leeds Teaching Hospitals NHS Trust - Leeds General Infirmary, Solent NHS Trust, Highpoint Venue - Pain Clinic, NHS Foundation Trust - Cambridge University Hospitals, University of Cambridge - Academic Division of Neurosurgery, Bangor University - Centre for Health Economics and Medicines Evaluation (CHEME), The Walton Centre NHS Foundation Trust and University of Liverpool - Liverpool Clinical Trials Centre

The University of Manchester, University of Liverpool, Dresden University of Technology, Christian Medical College, Beijing University of Chinese Medicine, University of Copenhagen - The Parker Institute, University of Antioquia, Dresden University of Technology, McMaster University, The University of Manchester and University of Liverpool - Liverpool Clinical Trials Centre

Johns Hopkins University, University of Liverpool, University of Liverpool, Cochrane, The University of Manchester, Johns Hopkins University - Bloomberg School of Public Health, University of Liverpool and University of Liverpool - Liverpool Clinical Trials Centre

University of Liverpool, University of Liverpool, Capital Medical University - Beijing Luhe Hospital, University of Liverpool and University of Liverpool - Liverpool Clinical Trials Centre