1. Maternal and Fetal Health Research Centre, School of Clinical and Laboratory Science, University of Manchester, Manchester, United Kingdom,
2. Department of Human and Clinical Anatomy, Sultan Qaboos University Hospital, Sultanate of Oman
3. Maternal and Fetal Health Research Centre, School of Clinical and Laboratory Science, University of Manchester, Manchester, United Kingdom, Department of Reproductive Medicine, St Mary's Hospital, Manchester, United Kingdom
4. Department of Obstetrics and Gynaecology, University of Padua, Italy
5. Department of Obstetrics and Gynecology, University of Illinois at Chicago, Chicago, Illinois