Prevalence and clinical characteristics of headache among medical students, Isfahan, Iran.

J Res Med Sci · 2013 · PMC3743313 · PMID 23961279

Europe PMC

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might be significantno p-value reported

Socio-economic and the year of study might be significant factors in the prevalence of headache.

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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.