1 Department of Obstetrics and Gynaecology, Fetal-Maternal Medicine, Medisch Spectrum Twente, Enschede, The Netherlands.
2 Faculty of Health Sciences and Medicines, Institute of Clinical Medicines, Herlev and Gentofte Hospital, University of Copenhagen, Kobenhavn, Denmark.
3 UNDP-UNFPA-UNICEF-WHO-World Bank Special Programme of Research, Development and Research Training in Human Reproduction (HRP), World Health Organization, Geneva, Switzerland.
4 IRD, Inserm, Ceped, Université Paris Cité, Paris, France.
5 University of Parma, Parma, Italy.
6 National Perinatal Epidemiology Centre, University College Cork, Cork, Ireland.
7 Department of Obstetrics and Gynaecology, Lithuanian University of Health Sciences, Kaunas, Lithuania.
8 Department of Obstetrics and Gynaecology, Haukeland University Hospital, Bergen, Norway.
9 Department of Clinical Medicine, University of Bergen, Bergen, Norway.
10 National Maternity Hospital, Dublin, Ireland.
11 Department of Obstetrics and Gynaecology, Palmerston North Hospital, Te Pae Hauora o Ruahine o Tararua, MidCentral, Palmerston North, New Zealand.
12 Department of Obstetrics and Gynaecology, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Goteborg, Sweden.
13 Goethe University Frankfurt, Frankfurt am Main, Germany.
14 Perinatal Centre, University of Frankfurt, Frankfurt am Main, Germany.
15 Department of Obstetrics and Gynaecology, Hayatabad Medical Complex, Peshawar, Pakistan.
16 Department of Perinatology, University Medical Centre, Ljubljana, Slovenia.
17 Department of Obstetrics and Gynaecology, Institute for Maternal and Child Health-IRCCS Burlo Garofolo, Trieste, Italy.
18 Department of Obstetrics and Gynaecology, Hospital Universitari Mútua Terrassa, Terrassa, Spain.
19 The National Maternity Hospital, University College Dublin, Dublin, Ireland.
20 Institution of Health Science Research, Akureyri Hospital, University of Akureyri, Akureyri, Iceland.
21 Hospital e Maternidade Santa Joana, São Paulo, Brazil.