[1] Univ Amsterdam, Amsterdam UMC, Dept Obstet & Gynecol, Acad Med Ctr, Amsterdam, Netherlands
[2] Univ Groningen, Univ Med Ctr Groningen, Dept Obstet & Gynecol, Groningen, Netherlands
[3] Ctr Prenatal Diag & Human Genet, Berlin, Germany
[4] Univ Western Sydney, Sydney, NSW, Australia
[5] Univ Tubingen, Dept Obstet & Gynecol, Tubingen, Germany
[6] Univ Oxford, Nuffield Dept Womens & Reprod Hlth, Oxford, England
[7] St Georges Univ London, Fetal Med Unit, London, England
[8] Chinese Univ Hong Kong, Dept Obstet & Gynaecol, Hong Kong, Peoples R China
[9] Paris Cite Univ, Hop Necker Enfants Malad, AP HP, Dept Obstet & Fetal Med, Paris, France
[10] Kings Coll Hosp London, Fetal Med Res Inst, London, England