[1] Cairo Univ, Fac Med, Fetal Med Unit, Cairo, Egypt
[2] Natl Res Ctr, Reprod Hlth Res Dept, Cairo, Egypt
[3] Benha Univ, Fac Med, Dept Obstet & Gynecol, Banha, Egypt
[4] Darrent Valley Hosp, Dept Obstet & Gynecol, Dartford, England
[5] Natl Res Ctr, Prenatal Diag & Fetal Med Dept, Human Genet & Genome Res Div, Cairo, Egypt
[6] Cairo Univ, Fac Med, Dept Obstet & Gynecol, Fetal Med Unit, Cairo, Egypt
[7] Cairo Univ, Fac Med, Dept Pediat, Cairo, Egypt
[8] Cairo Univ, Fac Med, Dept Obstet & Gynecol, Cairo, Egypt