1. Department of Human Histology and Embryology, School of Medicine, Collegium Medicum, University of Warmia and Mazury, 10-082 Olsztyn, Poland
2. Department of Gynecology and Obstetrics, School of Medicine, Collegium Medicum, University of Warmia and Mazury, 10-082 Olsztyn, Poland
3. Department of Human Physiology, School of Medicine, Collegium Medicum, University of Warmia and Mazury, 10-082 Olsztyn, Poland
4. Department of Hormonal Action Mechanisms, Institute of Animal Reproduction and Food Research, Polish Academy of Science, 10-748 Olsztyn, Poland
5. Department of Pathomorphology, The Regional Specialist Hospital, 10-561 Olsztyn, Poland
6. Department of Histology, Medical University of Gdansk, 80-211 Gdansk, Poland