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Fig. 1 | The Journal of Headache and Pain

Fig. 1

From: Headache-related circuits and high frequencies evaluated by EEG, MRI, PET as potential biomarkers to differentiate chronic and episodic migraine: Evidence from a systematic review

Fig. 1

a Flowchart of the study selection process as carried out in accordance with the PRISMA guidelines. b Distribution of included publications over time, from year 2000 onwards. c Number of included publications by recording type (e.g., EEG, MEG, fMRI, or PET). Note that Pan and colleagues [14] included both EEG and fMRI recordings in their study. For that reason, panel (a) shows 24 studies but panels (b) and (c) indicates 25 recording modalities

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The Journal of Headache and Pain

ISSN: 1129-2377

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