For citations:
Polivanova T.V., Kasparov E.V., Vshivkov V.A. Age-related features of gastritis activity in schoolchildren with gastroesophageal reflux disease. Russian Pediatric Journal. 2022;25(2):116-120. (In Russ.) https://doi.org/10.46563/1560-9561-2022-25-2-116-120. EDN: cmqpxj