Chronic daily headache.
Smith
Robert
R
D002908:Chronic Disease; D003937:Diagnosis, Differential; D005194:Family Practice / Q000379:methods*; D006261:Headache / Q000145:classification / Q000175:diagnosis / Q000628:therapy; D006801:Humans; D008403:Mass Screening; D010507:Periodicity; D010819:Physician's Role; D011379:Prognosis