International Classification of Headache Disorders

https://www.wikidata.org/wiki/Q2976581

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Medicine 48.2M papers	Internal medicine 20.6M papers	Psychology 17.6M papers	Surgery 7.6M papers
Psychiatry 4.4M papers	Anesthesia 2.1M papers	Migraine 71.8k papers	Headaches 31.1k papers
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International Classification of Headache Disorders 2,125 papers
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