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Fig. 1 | The Journal of Headache and Pain

Fig. 1

From: Headache characteristics in COVID-19 pandemic-a survey study

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

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