DOI:
10.1055/s-00000036
Laryngo-Rhino-Otologie
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References
Ross SM.
Echinacea purpurea: A Proprietary Extract of Echinacea purpurea Is Shown to be Safe and Effective in the Prevention of the Common Cold.
Holist Nurs Pract 2016;
30: 54-57
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