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Modarai, M., Gertsch, J., Suter, A., Heinrich, M. and 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. 567-573. 10.1211/jpp.59.4.0012.