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Table 2 Inclusion/exclusion criteria

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

Inclusion criteria

English language articles published in peer-reviewed journals (original articles and reviews) or articles from trials registered in

Subjects with migraine defined with any version of the International Classification of Headache Disorders

Use of recordings of functional neural activity using: EEG, MEG, fMRI, PET, or NIRS

Exclusion criteria

No CM and/or EM groups in the study or no direct comparison between both using EEG, MEG, fMRI, PET, or NIRS

Existence of comorbidities (e.g., epilepsy)