What is of great concern, however, is that MRI variables, a common measure of disease activity and thus treatment efficacy, seem to be influenced by season. This could bias trials aimed at assessing the effect of drugs on disease activity and need to be considered when designing future studies.
JONATAN SALZER, M.D., is a doctoral student in the department of pharmacology and clinical neuroscience at Umeå (Sweden) University. He has no relevant disclosures.
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