1. Gravirovska N.G., ZalyubovskаО.I. REGIONAL PECULIARITIES OF DUODENUM PEPTIC ULCER PREVALENCE INDEXES AND TENDENCY OF THEIR DEVELOPMENT IN KHARKOV AND DNEPROPETROVSK REGIONS // The Journal of V. N. Karazin Kharkiv National University, series "Medicine". 1. № 21. C. 37-42.