Botulinum toxin for chronic migraine.
D019274:Botulinum Toxins, Type A / Q000009:adverse effects / Q000191:economics / Q000627:therapeutic use*; D002908:Chronic Disease; D016527:Drug Costs; D006801:Humans; D008881:Migraine Disorders / Q000517:prevention & control*; D009465:Neuromuscular Agents / Q000009:adverse effects / Q000191:economics / Q000627:therapeutic use*; D016032:Randomized Controlled Trials as Topic
D009465:Neuromuscular Agents; D019274:Botulinum Toxins, Type A