Treatment of the common cold with unrefined echinacea. A randomized, double-blind, placebo-controlled trial.
Barrett BP; Brown RL; Locken K; Maberry R; Bobula JA; D'Alessio D; Annals Of Internal Medicine, 2002, vol. 137, issue 12, p 939, ISSN 15393704. ISBN 15393704.

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