TY JOUR TI STRUCTURE AND ANALYSIS OF THE CAUSES OF PREMATURE BIRTH IN THE ASTRAKHAN REGION KW preterm birth KW risk factors JO CASPIANJOURNALOF MEDICINE AND PHARMACY AU Tishkova, O.G. AU Khalidolla, N.K. AU Nasyrova, D.A. AU Romanenko, K.M. PY 2024 IS 5 PB Astrakhan State Medical University