Department of Obstetrics and Gynecology, Women's Health Hospital, Assiut University, Asiut, Egypt;2. Division of Pediatric Urology, Texas Children's Hospital Pavilion for Women, Houston, TX, USA;3. Department of Obstetrics and Gynecology, Baylor College of Medicine and Texas Children's Fetal Center, Houston, TX, USA;4. Department of Pediatrics, Baylor College of Medicine and Texas Children's Fetal Center, Texas Children's Hospital Pavilion for Women, Houston, TX, USA;5. Renal Section, Department of Pediatrics, Baylor College of Medicine, Texas Children's Hospital, Houston, TX, USA;6. Department of Obstetrics and Gynecology, Mayo Clinic Fetal Diagnostic and Therapeutic Center, Mayo Clinic College of Medicine, Rochester, MN, USA