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Echinacea for Treating the Common Cold: A Randomized Trial
Bruce Barrett, MD, PhD; Roger Brown, PhD; Dave Rakel, MD; Marlon Mundt, PhD; Kerry Bone, Dip Phyto; Shari Barlow, BA; Tola Ewers, MS
Annals of Internal Medicine 2010;153:769-777.
doi:10.7326/0003-4819-153-12-201012210-00003
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