1. Department of Anatomy, Poznan University of Medical Sciences, 60‑781 Poznań, Poland
2. Division of Infertility and Reproductive Endocrinology, Department of Gynecology, Obstetrics and Gynecological Oncology, Poznan University of Medical Sciences, 60‑535 Poznań, Poland
3. Department of Histology and Embryology, Poznan University of Medical Sciences, 60‑781 Poznań, Poland
4. Department of Obstetrics and Gynecology, University Hospital and Masaryk University, 62500 Brno, Czech Republic
5. Department of Pathophysiology, Poznań University of Medical Sciences, 60‑806 Poznań, Poland
6. Department of Clinical and Experimental Endocrinology, Medical University of Gdańsk, 80‑211 Gdańsk, Poland
7. Faculty of Biology and Biotechnology, University of Warmia and Mazury in Olsztyn, 10‑719 Olsztyn, Poland
8. Division of Histology and Embryology, Department of Human Morphology and Embryology, Wroclaw Medical University, 50‑368 Wroclaw, Poland