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Treatment of the Common Cold with Unrefined Echinacea: A Randomized, Double-Blind, Placebo-Controlled Trial
Bruce P. Barrett, MD, PhD; Roger L. Brown, PhD; Kristin Locken, BA; Rob Maberry, BA; James A. Bobula, PhD; Donn D'Alessio, MD
Annals of Internal Medicine 2002;137:939-946. doi:10.7326/0003-4819-137-12-200212170-00006

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