Echinacea purpurea for prevention of experimental rhinovirus colds.
Sperber SJ; Shah LP; Gilbert RD; Ritchey TW; Monto AS; Clinical Infectious Diseases: An Official Publication Of The Infectious Diseases Society Of America, 2004, vol. 38, issue 10, p 1367, ISSN 15376591. ISBN 15376591.

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