1. Department of Primary Care and Public Health, School of Public Health, Imperial College of London, London, United Kingdom
2. Department of Public Health, Federico II University, Naples, Italy
3. Department of Medicine, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, Canada
4. Department of Community Health Sciences, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, Canada
5. Queen Square Multiple Sclerosis Centre, Department of Neuroinflammation, University College London Queen Square Institute of Neurology, Faculty of Brain Sciences, University College London, London, United Kingdom
6. National Institute for Health Research, University College London Hospitals, Biomedical Research Centre, London, United Kingdom