1. Department of Biomedical Engineering, Faculty of Engineering; Tel Aviv University; Tel Aviv 69978 Israel
2. Ultrasound Unit in Obstetrics and Gynecology, Lis Maternity Hospital; Tel Aviv Sourasky Medical Center; Tel Aviv 64239 Israel
3. Sackler Faculty of Medicine; Tel Aviv University; Tel Aviv 69978 Israel
4. Department of Obstetrics and Gynecology; Medical University of Graz; Graz A-8036 Austria
5. Department of Obstetrics and Gynecology; Helen Schneider Hospital for Women, Rabin Medical Center; Petach Tikva 9100 Israel