Medication overuse headache in Scandinavia--comments and questions.
Haag
Gunther
G
Klinik
Michael-Balint
MB
Jensen
R
R
Bendtsen
L
L
D051271:Headache Disorders, Secondary / Q000453:epidemiology*; D006801:Humans; D012537:Scandinavian and Nordic Countries / Q000453:epidemiology