For citations:

Kharitonov D.V., Sapozhnikov V.G., Kharitonova L.A. About the constitutional features of gastric and duodenal ulcer in children. Rossiyskiy Vestnik Perinatologii i Pediatrii (Russian Bulletin of Perinatology and Pediatrics). 2022;67(6):63-67. (In Russ.) https://doi.org/10.21508/1027-4065-2022-67-6-63-67