DOI: 10.1055/s-00000101

Zeitschrift für Phytotherapie

References

Karsch-Völk M, Barrett B, Kiefer D. et al.
Echinacea for preventing and treating the common cold.

Cochrane Database Syst Rev 2014;
2: CD000530.
DOI: 10.1002/14651858.CD000530.pub3.

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