1. Department of Gynecological Endocrinology, Poznan University of Medical Sciences, Poznan, Poland;
2. Students Scientific Society of the Department of Gynecological Endocrinology, Poznan University of Medical Sciences, Poznan, Poland;
3. Division of Gynecological Surgery, Poznan University of Medical Sciences, Poznan, Poland;
4. Department of Pathology, Gynecological and Obstetric Clinical Hospital in Poznan, Poznan, Poland;
5. Department of Reproductive Medicine and Child Development, Division of Gynecology and Obstetrics, University of Pisa, Pisa, Italy