DOI:
10.1055/s-00000058
Planta Medica
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References
Melchart DV, Walther E, Linde K, Brandmaier R, Lersch C.
Echinacea root extracts for the prevention of upper respiratory tract infections: a double-blind, placebo-controlled randomized trial.
Arch Fam Med 1998;
7: 541-545
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