Ravasio R. Economic Analysis of the Immunostimulant OM-85 for the Prevention of Paediatric Recurrent Upper Respiratory Tract Infections. Grhta [Internet]. 2015 Sep. 17 [cited 2025 Apr. 18];2(3):135-42. Available from: https://journals.aboutscience.eu/index.php/grhta/article/view/338