LONDON, England, May 5 -- Cephalalgia, a peer-reviewed journal that says it features all aspects of headache from the International Headache Society, published research articles on the following topics in its May 2021 edition:

Original Articles:

* Sex differences in prevalence of migraine trigger factors: A cross-sectional study

* Prevalence and risk factors of migraine and non-migraine headache in older people - results of the Heinz Nixdorf Recall study