1. Department of Obstetrics and Gynaecology, St. Vinzenz Hospital, Hanau, Germany
2. Institute of Coagulation Disorders in Obstetrics and Gynaecology, Hausen, Germany
3. Democritus University of Thrace, Department of Obstetrics and Gynecology, Alexandroupolis, Greece
4. Department of Obstetrics and Gynaecology, RWTH University of Aachen, Germany
5. Department of Obstetrics and Gynaecology, City Hospital of Aschaffenburg, Aschaffenburg, Germany
6. Department of Obstetrics and Gynaecology, University of Debrecen, Hungary