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Woelkart, K., Marth, E., Suter, A., Schoop, R., Raggam, R.B., Koidl, C., Kleinhappl, B. and Bauer, R. (2006) Bioavailability and Pharmacokinetics of Echinacea purpurea Preparations and Their Interaction with the Immune System. International Journal of clinical Pharmacology and Therapeutics, 44, 401-408.
http://dx.doi.org/10.5414/CPP44401

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