1. I.M. Sechenov First Moscow State Medical University (Sechenov University), Ministry of Health of Russia, Amgalan Maternal Hospital, Ulan-Bator, Mongolia
2. I.M. Sechenov First Moscow State Medical University (Sechenov University), Ministry of Health of Russia
3. I.M. Sechenov First Moscow State Medical University (Sechenov University), Ministry of Health of Russia, Institute of Preventive and Social Medicine, Gaaz Moscow Medical and Social Institute, Moscow