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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)