An evidence-based systematic review of echinacea ( E. angustifolia DC, E. pallida, E. purpurea) by the natural standard research collaboration

2005 
(2005). An Evidence-Based Systematic Review of Echinacea (E. angustifolia DC, E. pallida, E. purpurea) by the Natural Standard Research Collaboration. Journal of Herbal Pharmacotherapy: Vol. 5, No. 2, pp. 57-88.
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