TY JOUR TI ORGANIZATIONAL AND METHODICAL APPROACHES OF STUDYING INFANTILE MORTALITY KW infant mortality KW extragenital pathology KW child population health KW congenital malformations JO CASPIANJOURNALOF MEDICINE AND PHARMACY AU Shapovalova, M.A. AU Ugurchieva, K.Y. AU Yaroslavtsev, A.S. PY 2023 IS 4 PB Astrakhan State Medical University