Medication overuse headache in Scandinavia.
Jensen
R
R
Danish Headache Centre, Department of Neurology, University of Copenhagen, Glostrup Hospital, Glostrup, Denmark.
Bendtsen
L
L
D051271:Headache Disorders, Secondary / Q000453:epidemiology* / Q000628:therapy; D006801:Humans; D012537:Scandinavian and Nordic Countries / Q000453:epidemiology