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Modarai, M; Gertsch, J; Suter, A; Heinrich, M; Kortenkamp, A (2007). Cytochrome P450 inhibitory action of Echinacea preparations differs widely and co-varies with alkylamide content. Journal of pharmacy and pharmacology, 59(4), pp. 567-73. London: Royal Pharmaceutical Society of Great Britain 10.1211/jpp.59.4.0012
