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Echinacea for preventing and treating the common cold.
Karsch-Völk M, Barrett B, Kiefer D, Bauer R, Ardjomand-Woelkart K, Linde K. Karsch-Völk M, et al. Among authors: ardjomand woelkart k. Cochrane Database Syst Rev. 2014 Feb 20;2014(2):CD000530. doi: 10.1002/14651858.CD000530.pub3. Cochrane Database Syst Rev. 2014. PMID: 24554461 Free PMC article. Review.