Fig. 2From: Gamma-aminobutyric acid and glutamate/glutamine levels in the dentate nucleus and periaqueductal gray with episodic and chronic migraine: a proton magnetic resonance spectroscopy studyFlow of the participants during the study. Abbreviations: CM, chronic migraine; EM, episodic migraine; MOH, medication overuse headache; MRS, magnetic resonance spectroscopyBack to article page