title: The value of biofeedback in the treatment of chronic headache: a four-year retrospective study.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D001676:Biofeedback, Psychology; D002648:Child; D002908:Chronic Disease; D005260:Female; D006261:Headache / Q000628:therapy*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012737:Sex Factors