title: Appendix C: AAN Classification of Evidence for the Rating of a Therapeutic Study.
mesh_terms: D006261:Headache / Q000188:drug therapy*; D006801:Humans; D009462:Neurology / Q000592:standards*; D016032:Randomized Controlled Trials as Topic / Q000145:classification / Q000379:methods / Q000592:standards; D012955:Societies, Medical / Q000592:standards*