DOI:
10.1055/s-00000011
DMW - Deutsche Medizinische Wochenschrift
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References
Jawad M. Schoop R. Suter A. et al.
Safety and Efficacy Profile of Echinacea purpurea to Prevent Common Cold Episodes: A Randomized, Double-Blind, Placebo-Controlled Trial.
Evid Based Complement Altern Med 2012; 841315
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