For citations:
Chirkina T.M., Aslanov B.I., Kokovina Yu.V., Bakulin I.G. Epidemiology of pathology of the upper gastrointestinal tract in Saint Petersburg. Experimental and Clinical Gastroenterology. 2020;174(5):42-46. (In Russ.) https://doi.org/10.31146/1682-8658-ecg-177-5-42-46