(Q40835053)
Statements
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Echinacea root extracts for the prevention of upper respiratory tract infections: a double-blind, placebo-controlled randomized trial (English)
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Melchart D
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Walther E
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Linde K
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Brandmaier R
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Lersch C
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1 November 1998
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7
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6
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541-545
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Identifiers
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