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REGIONAL PECULIARITIES OF DUODENUM PEPTIC ULCER PREVALENCE INDEXES AND TENDENCY OF THEIR DEVELOPMENT IN KHARKOV AND DNEPROPETROVSK REGIONS. J. V. N. Karazin Khark. Nat. Univ., Ser. Med. 2015;(21):37-42. дата звернення Жовтень 25, 2026. https://periodicals.karazin.ua/medicine/article/view/6892