Jong, Miek C., Stephen L. Buskin, Lydia Ilyenko, Irina Kholodova, Julia Burkart, Stephan Weber, Thomas Keller, and Petra Klement. 2016. “Effectiveness, Safety and Tolerability of a Complex Homeopathic Medicinal Product in the Prevention of Recurrent Acute Upper Respiratory Tract Infections in Children: A Multicenter, Open, Comparative, Randomized, Controlled Clinical Trial”. Multidisciplinary Respiratory Medicine 11 (1). https://doi.org/10.4081/mrm.2016.313.