Selection bias in observational studies: out of control?
- PMID: 19139362
- DOI: 10.1212/01.wnl.0000339046.10288.fb
Selection bias in observational studies: out of control?
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Comorbidity delays diagnosis and increases disability at diagnosis in MS.Neurology. 2009 Jan 13;72(2):117-24. doi: 10.1212/01.wnl.0000333252.78173.5f. Epub 2008 Oct 29. Neurology. 2009. PMID: 18971448 Free PMC article.
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