DOI:
10.1055/s-00000036
Laryngo-Rhino-Otologie
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References
Karsch-Völk M, Berraett B, Kiefer D. et al.
Echinacea für preventing and treating the common cold.
Cochrane Database Syst Rev. 2014
DOI: 10.1002/14651858.CD000530.pub3
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