1. Department of Obstetrics and Gynecology, Pomeranian University of Medicine, Szczecin, Poland;
2. Department of Microbiology, Immunology and Laboratory Medicine, Pomeranian Medical University, Szczecin, Poland;
3. Department of Nephrology, Transplantology and Internal Medicine, Pomeranian Univesity of Medicine, Szczecin, Poland;
4. Department of Obstetrics and Gynecology, Ernst-Moritz-Arndt Universitat Greifswald, Mecklenburg-Vorpommern, Germany