1. Clinical Research Centre; Medical University of Bialystok; Poland
2. Department of Reproduction and Gynecological Endocrinology; Medical University of Bialystok; Poland
3. First Department of Obstetrics and Gynecology; Medical University of Warsaw; Poland
4. Department of Biochemical Diagnostics; Medical University of Bialystok; Poland
5. Department of Endocrinology, Diabetology and Internal Medicine; Medical University of Bialystok; Poland