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L.K. Parkhomenko, L.A. Strashok, E.M. Zavelya, M.Yu. Isakova, A.V. Yeshchenko, Zh.V. Polishchuk. "Clinical and endoscopic features of the upper digestive tract pathology in children and adolescents depending on age." Zdorovʹe Rebenka (2017) 895-899