[1] Rigshosp, Dept Obstet & Gynecol, Fetal Med Unit, Copenhagen, Denmark
[2] Univ Copenhagen, Fac Hlth Sci, Copenhagen, Denmark
[3] Sahlgrens Univ Hosp, Dept Obstet & Gynecol, Gothenburg, Sweden
[4] Univ Gothenburg, Inst Clin Sci, Sahlgrenska Acad, Ctr Perinatal Med & Hlth, Gothenburg, Sweden
[5] Univ Gothenburg, Inst Clin Sci, Sahlgrenska Acad, Dept Obstet & Gynecol, Gothenburg, Sweden
[6] Stellenbosch Univ, Dept Obstet & Gynecol, Cape Town, South Africa
[7] Uppsala Univ, Dept Womens & Childrens Hlth, Uppsala, Sweden
[8] Norwegian Univ Sci & Technol, NTNU, Fac Med & Hlth Sci, Dept Clin & Mol Med, Trondheim, Norway
[9] Univ Trondheim Hosp, Dept Obstet & Gynecol, Trondheim, Norway
[10] Helsinki Univ Hosp, Fetomaternal Med Ctr, Dept Obstet & Gynecol, Helsinki, Finland
[11] Univ Helsinki, Helsinki, Finland
[12] Univ Helsinki, Helsinki Univ Hosp, Helsinki, Finland
[13] Univ Iceland, Fac Med, Reykjavik, Iceland
[14] Landspitali The Natl Univ Hosp Iceland, Dept Neurol, Reykjavik, Iceland
[15] Rigshosp, Dept Clin Biochem, Copenhagen, Denmark