1. Department of Obstetrics and Gynecology, District Public Hospital in Poznan, 60-479 Poznań, Poland
2. Dominik Pruski Gynecology Specialised Practise, 60-408 Poznań, Poland
3. Doctoral School, Poznan University of Medical Sciences, 61-701 Poznań, Poland
4. Department of Immunology, Pathomorphology and Clinical Immunology, Poznan University of Medical Sciences, 60-806 Poznań, Poland
5. Department of Gynecological Endocrinology, Jagiellonian University Medical College, 31-008 Cracow, Poland
6. Marcin Przybylski Gynecology Specialised Practise, 60-682 Poznań, Poland