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Supertopics:
Echinacea
Cold Preventers
echinacea halves the risk of catching a cold
Documents:
echinacea for prevention of the common cold (review)
web
Sachin A Shah, Stephen Sander
Lancet Infect Dis
2007-07-01
echinacea for prevention of the common cold (review) (pdf)
web
Sachin A Shah, Stephen Sander
Lancet Infect Dis
2007-07-01