1. Clinical Institute of Reproductive Medicine, Yekaterinburg 620014, Russia
2. Assisted Reproductive Technology Center, Graduate School of Environmental, Life, Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
3. Research Institute of Obstetrics, Gynecology and Reproductology Named after D. O. Ott, St. Petersburg 199034, Russia
4. Institute of Cytology, Russian Academy of Sciences, St. Petersburg 194064, Russia
5. Department of Histology and Embryology Named after Prof. A.G. Knorre, St. Petersburg State Pediatric Medical University, St. Petersburg 194100, Russia