University of Glasgow - Institute of Neuroscience and Psychology, Government of the United Kingdom - Oxford University Hospitals NHS Foundation Trust, University of Glasgow, University of Edinburgh - Centre for Clinical Brain Sciences, University of Glasgow - Robertson Institute of Biostatistics and Clinical Trials Unit, University of Glasgow, University of Edinburgh - Centre for Clinical Brain Sciences, University of Nottingham, University of Newcastle, University of Aberdeen - Medical Sciences and Nutrition, Royal Victoria Infirmary, Imperial College London - Charing Cross Hospital, NHS Foundation Trust - St. Georges University Hospitals, NHS Foundation Trust - Addenbrooke's Hospital, Government of the United Kingdom - University Hospitals of North Midlands, Aberdeen Royal Infirmary, King’s College Hospital NHS Foundation Trust, Countess of Chester NHS Foundation Trust, University of Edinburgh, University of Oxford, University College London, Government of the United Kingdom - Luton and Dunstable University Hospital, Norfolk and Norwich University Hospital, Leeds General Infirmary - Department of Neurology, University of Southampton - Southampton General Hospital, Nottingham University Hospitals NHS Trust, The Queen Elizabeth Hospital, Watford General Hospital, Royal Victoria Hospital, Taunton & Somerset NHS Foundation Trust, Manchester Centre for Clinical Neurosciences and Independent