1Department of Obstetrics and Gynaecology, Heinrich-Heine-University Medical Centre, Moorenstrasse 5, 40225 Duesseldorf, Germany
2Department of Obstetrics and Gynecology, Dormagen Hospital, Dr.-Geldmacher-Straße 20, 41540 Dormagen, Germany
3Department of Nephrology, DKD Helios Clinic Wiesbaden GbR, Aukammallee 33, 65191 Wiesbaden, Germany
4Department of Mathematics, Faculty of Mathematics and Natural Sciences, Heinrich-Heine-University, Universitätsstrasse 1, 40225 Düsseldorf, Germany
5Department of Obstetrics and Gynaecology, Helios University Medical Center Wuppertal, Heusnerstraße 40, 42283 Wuppertal, Germany