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Table 1 Query strings used in each electronic database to conduct the initial screening of documents

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

Electronic Database Query string
WoS ((TS = ((migraine or headache) AND episodic AND chronic AND (eegEEG OR fmri OR meg OR pet OR nirs))))
Scopus ( TITLE-ABS-KEY ( ( migraine OR headache) AND episodic AND chronic AND ( eeg OR fmri OR meg OR pet OR nirs))) AND DOCTYPE ( ar OR re) AND LANGUAGE ( english)
PubMed ("migraine"[Title/Abstract] OR "headache"[Title/Abstract]) AND "episodic"[Title/Abstract] AND "chronic"[Title/Abstract] AND ("eeg"[Title/Abstract] OR "fmri"[Title/Abstract] OR "meg"[Title/Abstract] OR "pet"[Title/Abstract] OR "nirs"[Title/Abstract]) AND 1990/01/01:3000/12/31[Date—Publication]
  1. Note: The term search was conducted on the title, abstract, and keywords of the documents without date restrictions
  2. a Language, and document type are options available outside the search box for WoS database