Boiarska, L. M., L. V. Hrebeniuk, K. O. Ivanova, and V. Akhtyrsky. “Condition of Nasopharynx Contamination in Children With Chronic Tonsillitis and Gastroesophageal Reflux Disease”. Zaporozhye Medical Journal, no. 5, Oct. 2019, doi:10.14739/2310-1210.2019.5.179441.