DOI:
10.1055/s-00000058
Planta Medica
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References
Barrett BP, Brown RL, Locken K, Maberry R, Bobula JA, DʼAlessio DJ.
Treatment of the common cold with unrefined Echinacea: A randomized, double-blind, placebo-controlled trial.
Ann Intern Med 2002;
137: 939-946
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