1 Multiple Sclerosis International Federation, London SE1 4YR, UK. Electronic address: jlaurson@doube.net.
2 Multiple Sclerosis International Federation, London SE1 4YR, UK.
3 WHO Collaborating Centre in Evidence-Based Research Synthesis and Guideline Development, Regione Emilia-Romagna, Bologna, Italy; Unit of Epidemiology and Statistics, IRCCS Istituto delle Scienze Neurologiche di Bologna, Bologna, Italy; Cochrane Review Group Multiple Sclerosis and Rare Diseases of the CNS, Bologna, Italy.
4 Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, ON, Canada; Department of Family Medicine, Queen's University, Kingston, ON, Canada; Peterborough Public Health, Peterborough, ON, Canada.
5 Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA; Department of Medicine, University Teaching Hospital, Lusaka, Zambia.