1. Department of Obstetrics, Gynecology and Perinatology, P.L. Shupyk National Medical Academy of Postgraduate Education, Kyiv, Ukraine
2. Unit of Reproductive Endocrinology, First Department of Obstetrics and Gynecology, Medical School, Aristotle University of Thessaloniki, Thessaloniki, Greece
3. Precarpathian Center for Human Reproduction, Ministry of Health of Ukraine, Kiev, Ukraine