[1] Copenhagen Univ Hosp, Rigshosp, Dept Obstet, Ctr Fetal Med, Copenhagen, Denmark
[2] Copenhagen Univ Hosp, Rigshosp, Dept Cardiol, Copenhagen, Denmark
[3] Univ Copenhagen, Dept Med & Hlth Sci, Copenhagen, Denmark
[4] Herlev & Gentofte Hosp, Dept Clin Biochem, Herlev, Denmark
[5] Div Translat Med, Toronto, ON, Canada
[6] Hosp Sick Children, Toronto, ON, Canada
[7] Univ Toronto, Dept Med Biophys, Toronto, ON, Canada
[8] Univ Toronto, Dept Pediat, Toronto, ON, Canada
[9] Univ Toronto, Dept Diagnost Imaging, Div Paediat Cardiol, Toronto, ON, Canada