Jul 23, 2018 Sphenopalatine Ganglion Blockade Improves Connectivity in Medication Overuse Headache Sphenopalatine Ganglion Blockade Improves Connectivity in Medication Overuse HeadacheFor participants with chronic migraine with medication overuse headache (CMw/MOH), sphenopalatine ganglion (SPG) blockade treatment improves ... read morePublished on 2018-07-23