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Weishaupt, Ramon, Arnold Bächler, Simon Feldhaus, Günter Lang, Peter Klein, und Roland Schoop. "Safety and Dose-Dependent Effects of Echinacea for the Treatment of Acute Cold Episodes in Children: A Multicenter, Randomized, Open-Label Clinical Trial." Children (Basel) 2020.

Weishaupt, Ramon, et al. "Safety and Dose-Dependent Effects of Echinacea for the Treatment of Acute Cold Episodes in Children: A Multicenter, Randomized, Open-Label Clinical Trial." Children (Basel) 2020.