1. Fakultät für Medizin und Gesundheitswissenschaften, University Women’s Hospital, Klinikum Oldenburg, University of Oldenburg, Oldenburg, Germany;
2. Department of Obstetrics and Gynecology, University of Alexandria, Alexandria, Egypt;
3. Department of Clinical and Chemical Pathology, University of Alexandria, Alexandria, Egypt;
4. Department of Public Health and Preventive Medicine, University of Mansura, Mansura, Egypt