International Headache Society
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It has over 1,000 ordinary members (including national society members). The society publishes an international journal Cephalalgia. The society was incorporated in 1994 in England and Wales as a Company Limited by Guarantee and registered in 1995 as a charity.
International Headache Congress
The International Headache Congress (IHC) is held every second year, organized and hosted on behalf of IHS by a member national society.
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