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Median cost of daily defined dose of carbamazepine, phenobarbital, phenytoin, and valproic acid in different income groups of countries (in international dollars)

High: N=19; High middle: N=14; Low middle: N=23; Low: N=22. (World Health Organization, International Bureau for Epilepsy, International League Against Epilepsy. Atlas: Epilepsy Care in the World 2005. Geneva: WHO, 2005.)