Hamre, Harald J., Anja Glockmann, Michael Fischer, David S. Riley, Erik Baars, and Helmut Kiene. “Use and Safety of Anthroposophic Medications for Acute Respiratory and Ear Infections: A Prospective Cohort Study”. Drug Target Insights 2, no. 1 (January 1, 2007). Accessed March 28, 2024. https://journals.aboutscience.eu/index.php/dti/article/view/1302.