1. Department of Perinatology and Gynecology, Poznan University of Medical Sciences, Polna 33, 60-535 Poznan, Poland
2. Department of Endocrinology, Metabolism and Internal Medicine, Poznan University of Medical Sciences, Przybyszewskiego 49, 60-355 Poznan, Poland
3. Institute for Experimental Endocrinology, Charité-Universitätsmedizin Berlin, D-10115 Berlin, Germany