Towards a definition of intractable headache for use in clinical practice and trials.
Goadsby
P J
PJ
Headache Group, Institute of Neurology, London, UK. peterg@ion.ucl.ac.uk
Schoenen
J
J
Ferrari
M D
MD
Silberstein
S D
SD
Dodick
D
D
D002986:Clinical Trials as Topic / Q000592:standards*; D020773:Headache Disorders / Q000145:classification*; D006801:Humans; D038622:Internationality; D017410:Practice Guidelines as Topic; D010818:Practice Patterns, Physicians' / Q000592:standards*; D009626:Terminology as Topic