1. Federal State Budget Institution of Higher Education “Omsk State Medical University” of the Russian Ministry of Health, Omsk, Russia
2. Federal State Budget Institution National Medical Research Center for Obstetrics, Gynecology and Perinatology named after Academician V.I.Kulakov of the Ministry of Healthcare of Russian Federation, Moscow, Russia
3. Perinatal Centre of Omsk Regional Clinical Hospital, Omsk, Russia
4. Perinatal Center of the State Autonomous Institution of the Republic of Sakha (Yakutia) Republican Hospital No. 1, Yakutsk, Russia