Gravirovska, N. G., and ZalyubovskаО. I. “CHARACTERISTICS OF CHRONIC GASTRODUODENITIS PREVALENCE AND MORBIDITY INDEXES AND TENDENCY OF THEIR DYNAMICS IN KHARKOV AND DNEPROPETROVSK REGIONS”. The Journal of V. N. Karazin Kharkiv National University, Series "Medicine", no. 20, 1, pp. 22-27, https://periodicals.karazin.ua/medicine/article/view/6907.