00577naa#a2200181#i#450# EN\\bibl\64460 20241121195953.4 2712-8164 20230503b2023####ek#y0engy0150####ca RU ORGANIZATIONAL AND METHODICAL APPROACHES OF STUDYING INFANTILE MORTALITY Journal article Astrakhan Astrakhan State Medical University 2023 10 с. Journal article local Shapovalova Marina A. Ugurchieva Khyadi Yu. Yaroslavtsev Aleksandr Stanislavovich kaspmed.ru