DOI:
10.1055/s-00000058
Planta Medica
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References
Schulten B, Bulitta M, Ballering-Brühl B, Köster U, Schäfer M.
Efficacy of Echinacea purpurea in patients with a common cold: A placebo-controlled, randomised, double-blind clinical trial.
Arzneimittelforschung 2001;
51: 563-568
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