1. Department of Histology and Embryology, Poznań University of Medical Sciences, Poznań, 60-781, Poland
2. Department of Anatomy, Poznań University of Medical Sciences, Poznań, 60-781, Poland
3. Department of Clinical Pathomorphology, Poznań University of Medical Sciences, Poznań, 60-355, Poland
4. Division of Infertility and Reproductive Endocrinology, Department of Gynecology, Obstetrics and Gynecological Oncology, Poznań University of Medical Sciences, Poznań, 60-535, Poland
5. Department of Histology and Embryology, Wrocław Medical University, Wrocław, 50-368, Poland
6. Department of Nursing, Poznań University of Medical Sciences, Poznań, 60-179, Poland
7. Departament of Obstetrics and Womens Dieseases, Poznań University of Medical Sciences, Poznań, 60-535, Poland