Melatonin and vitamin D, two sides of the same coin, better to land on its edge to improve multiple sclerosis.

Proc Natl Acad Sci U S A · 2023 · PMC10083587 · PMID 36972442

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a clear trendno p-value reported

Another systematic review, covering ten studies, found a clear trend in MS prevalence when moving away from the equator, from Panama (8.5°N) to Argentina (38°S) ( 5 ).

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.