Swansea University - Swansea University Medical School, University of Göttingen - University Medical Centre, Imperial College London, University of Nottingham - Division of Clinical Neurosciences, University of Cambridge, University College London - UCL Queen Square Institute of Neurology, Newcastle Upon Tyne Hospitals NHS Foundation Trust, Lancaster University - Faculty of Health and Medicine, Leeds Teaching Hospitals NHS Trust, Brighton and Sussex University Hospitals NHS Trust, Clinical Neurosciences, Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, UK, Government of the United Kingdom - Royal Devon and Exeter NHS Foundation Trust, Government of the United Kingdom, Department of Health, National Health Service (NHS), University Hospitals Plymouth, Government of the United Kingdom - Luton and Dunstable University Hospital, University of Southampton - School of Clinical and Experimental Sciences, Government of the United Kingdom - Southend University Hospital, Belfast City Hospital, Royal Cornwall Hospital, Swansea Bay University Health Board, Government of the United Kingdom - Manchester Centre for Clinical Neurosciences, Government of the United Kingdom - Barts Health NHS Trust, Government of the United Kingdom - Sheffield Teaching Hospitals, South Devon NHS Foundation Trust, University College London - UCL Queen Square Institute of Neurology, Swansea University - Swansea University Medical School, Swansea University - UK MS Register, Imperial College London - Faculty of Medicine and Independent

University of Melbourne - Neuroepidemiology Unit, Oxford Brookes University, Deakin University, Swansea University - UK MS Register, Imperial College London - Faculty of Medicine, University of Melbourne - Neuroepidemiology Unit, University of Wollongong, affiliation not provided to SSRN, University of Melbourne - Centre for Epidemiology and Biostatistics, affiliation not provided to SSRN and Oxford Brookes University