Headache classification prior to the Ad Hoc criteria.
Department of Neurology, University Hospital, Zürich, Switzerland.
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Isler
D005060:Europe; D006261:Headache / Q000145:classification* / Q000266:history*; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D049690:History, Ancient; D006801:Humans