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. 2020 Oct 13;21(1):121. doi: 10.1186/s10194-020-01188-1

Fig. 1.

Fig. 1

Flowchart of the study. *Please note that some participants with previous headaches did not experience headache attacks during the pandemic (March–April 2020). **Only those participants with headache attacks during the pandemic could be included in the analyses, done in terms of before-after pandemic comparisons. M; male, F; female