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Echinacea for preventing and treating the common cold.
Linde K, Barrett B, Wölkart K, Bauer R, Melchart D. Linde K, et al. Among authors: wolkart k. Cochrane Database Syst Rev. 2006 Jan 25;(1):CD000530. doi: 10.1002/14651858.CD000530.pub2. Cochrane Database Syst Rev. 2006. PMID: 16437427 Updated. Review.