1. Department of Anatomy , Poznan University of Medical Sciences , Poznan , Poland
2. Division of Infertility and Reproductive Endocrinology, Department of Gynecology, Obstetrics and Gynecological Oncology , Poznan University of Medical Sciences , Poznan , Poland
3. Department of Histology and Embryology , Poznan University of Medical Sciences , Poznan , Poland
4. Department of Obstetrics and Gynecology , University Hospital and Masaryk University , Brno , Czech Republic
5. Department of Animal Physiology , University of Warmia and Mazury , Olsztyn , Poland
6. Veterinary Center , Nicolaus Copernicus University in Torun , Torun , Poland
7. Division of Histology and Embryology, Department of Human Morphology and Embryology , Wroclaw Medical University , Wroclaw , Poland
8. Division of Anatomy and Histology , University of Zielona Góra , Zielona Góra , Poland