title: Chronic daily headache in the absence of medication overuse: is daily or continuous pain more treatment-resistant than chronic daily headache with pain-free days?
authors.affiliation: Michigan Head-Pain and Neurological Institute, 3120 Professional Drive, Ann Arbor, MI 48104, USA. aelake3rd@mhni.com
authors.forename: Alvin E
authors.initials: AE
authors.lastname: Lake
mesh_terms: D002908:Chronic Disease; D002940:Circadian Rhythm; D004351:Drug Resistance; D006261:Headache / Q000188:drug therapy* / Q000503:physiopathology*; D006801:Humans