1. PreMediCare Prenatal Research Center, 21 Czarna Rola St., 61-625 Poznan, Poland
2. New Med Medical Center, 100 Szamotulska St., 60-566 Poznan, Poland
3. Department of Gynecology and Obstetrics, Institute of Medical Sciences, University of Zielona Gora, 28 Zyty St., 65-046 Zielona Gora, Poland
4. Department of Obstetrics and Gynecology, Hannover Medical School, Carl-Neuberg-Str. 1, D-30625 Hannover, Germany