Journal Article DIAGNOSIS AND CLASSIFICATION OF MULTIPLE SCLEROSIS Get access W I MCDONALD, PHD FRCP FRACP, W I MCDONALD, PHD FRCP FRACP Institute of Neurology, University of London Search for other works by this author on: Oxford Academic PubMed Google Scholar A M HALLIDAY, BSc MB ChB FBCS A M HALLIDAY, BSc MB ChB FBCS National Hospitals for Nervous DiseasesLondon Search for other works by this author on: Oxford Academic PubMed Google Scholar British Medical Bulletin, Volume 33, Issue 1, January 1977, Pages 4–8, https://doi.org/10.1093/oxfordjournals.bmb.a071393 Published: 01 January 1977
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McDonald et al. (1977) studied this question.