National Institute for Health and Clinical Excellence (NHS), Northern Health, National Institute for Health and Clinical Excellence (NHS), National Institute for Health and Clinical Excellence (NHS), National Institute for Health and Clinical Excellence (NHS), University College London - University College London Hospitals NHS Foundation Trust, National Hospital for Neurology and Neurosurgery, Government of the United Kingdom - Queen Elizabeth Hospital Birmingham, Government of the United Kingdom - Queen Elizabeth Hospital Birmingham, The Walton Centre NHS Foundation Trust, The Walton Centre NHS Foundation Trust, The Walton Centre NHS Foundation Trust, The University of Manchester, The University of Manchester, The University of Manchester - Salford Royal Hospital, Government of the United Kingdom - North Bristol NHS Trust, University Hospital Southampton, University of Oxford - John Radcliffe Hospital, Cardiff University, University of Southampton - University Hospital Southampton NHS Foundation Trust, King's College Hospital, Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle Upon Tyne Hospitals NHS Foundation Trust, Government of the United Kingdom - North Bristol NHS Trust, Government of the United Kingdom - Queen Elizabeth Hospital Birmingham, University College London, University College London - UCL Queen Square Institute of Neurology and University of Oxford