[1] Univ London, Acad Dept Obstet & Gynaecol, Fetal Med Unit, London, England
[2] John Radcliffe Hosp, Oxford OX3 9DU, England
[3] Univ Tromso, Fac Med, Womens Hlth & Perinatol Res Grp, Tromso, Norway
[4] Univ Hosp No Norway, Tromso, Norway
[5] Univ Groningen, Univ Med Ctr Groningen, Dept Obstet & Gynaecol, Fetal Med Unit, NL-9713 AV Groningen, Netherlands
[6] Univ Klin Gynakol Endokrinol & Reprod Med, Dept Frauenheilkunde, Innsbruck, Austria
[7] Grp Med Alem, San Isidro, Argentina
[8] NICHD, Perinatol Res Branch, NIH, DHHS, Detroit, MI USA
[9] Wayne State Univ, Sch Med, Dept Obstet & Gynecol, Detroit, MI 48201 USA
[10] CBF, Charite, Berlin, Germany
[11] Univ Toronto, Mt Sinai Hosp, Dept Obstet & Gynaecol, Maternal Fetal Med Div,Placenta Clin, Toronto, ON M5G 1X5, Canada
[12] Univ Toronto, Mt Sinai Hosp, Dept Med Imaging, Toronto, ON M5G 1X5, Canada
[13] Haukeland Hosp, Dept Obstet & Gynecol, N-5021 Bergen, Norway
[14] Univ Bergen, Dept Clin Med, Bergen, Norway
[15] Baylor Coll Med, Dept Obstet & Gynecol, Texas Childrens Fetal Ctr, Texas Childrens Hosp Pavil Women, Houston, TX 77030 USA
[16] Cambridge Univ Hosp NHS Fdn Trust, Addenbrookes Hosp, Rosie Hosp, Dept Fetal Med, Cambridge, England
[17] Katholieke Univ Leuven Hosp, Dept Dev & Regenerat, Louvain, Belgium
[18] Queen Elizabeth Hosp, Dept Obstet & Gynaecol, Hong Kong, Hong Kong, Peoples R China
[19] Chaim Sheba Med Ctr, IL-52621 Tel Hashomer, Israel
[20] Univ Tennessee, Memphis, TN USA
[21] Spedali Civil Brescia, Maternal Fetal Med Unit, I-25125 Brescia, Italy
[22] Fetal Med Ctr, Santiago, Chile
[23] Univ Sydney, Dept Obstet & Gynaecol, Westmead Hosp, Sydney, NSW 2006, Australia