1. School of Women's & Children's Health; UNSW Sydney; Sydney New South Wales Australia
2. Department of Maternal-Fetal Medicine; Royal Hospital for Women; Sydney New South Wales Australia
3. Department of Obstetrics & Gynecology; College of Medicine; King Saud University; Riyadh Saudi Arabia
4. Department of Maternal Fetal Medicine; King Khalid University Hospital; Riyadh Saudi Arabia