N.A. CHEREPANOVA2, R.S. ZAMALEEVA1, L.I. MALTSEVA1, A.V. FRIZINA2 1Kazan State Medical Academy — Branch Campus of RMACPE MH Russia, Kazan 2Volzhsk Central Municipal Hospital, Volzhsk Contact details: Cherepanova N.A. — PhD (medicine), Head of Delivery Ward Address: 46 Sovetskaya Str., Volzhsk, Russian Federation, 425005, tel. (83631) 6-37-73, e-mail: [email protected] Objective ― to study the doubtful […]