A. A. Grigoryants
Stavropol State Medical University,Dept of Obstetrics and Gynecology No. 2
Russian Federation

Grigoryants Armen A., PhD Med, Assistant,

Stavropol.

N. A. Burova
Dept of Obstetrics and Gynecology of Volgograd State Medical University
Russian Federation

Burova Natalya A., DM Sci (habil.), Associate Prof., Head of Department,

Volgograd.

V. V. Avrutskaya
Dept of Obstetrics and Gynecology No. 2 of Rostov State Medical University
Russian Federation

Avrutskaya Valeria V., DM Sci (habil.), Associate Prof., Prof.,

Rostov-on-Don.

I. I. Krukier
Rostov State Medical University, Obstetric and Gynecological Department of the Research Institute of Obstetrics and Pediatrics
Russian Federation

Krukier Irina I., DM Sci (habil.), Leading Researcher,

Rostov-on-Don.