1. Division of Infertility and Reproductive Endocrinology, Department of Gynecology, Obstetrics and Gynecological Oncology, Poznań University of Medical Sciences , 33 Polna St., 60-535 Poznań , Poland
2. Department of Anatomy, Poznań University of Medical Sciences , 6 Święcickiego St., 60-781 Poznań , Poland
3. Department of Histology and Embryology, Poznań University of Medical Sciences , 6 Świecickiego St., 60-781 Poznań , Poland
4. Department of Obstetrics and Gynecology, University Hospital and Masaryk University , 20 Jihlavská St., 625 00 Brno , Czech Republic
5. Department of Veterinary Surgery, Institute of Veterinary Medicine, Nicolaus Copernicus University in Toruń , 1 Lwowska St., 87-100 Toruń , Poland