1 Department of Obstetrics & Gynaecology, Ghent University Hospital, Ghent, Belgium.
2 Department of Obstetrics, Birth Centre Wilhelmina's Children Hospital, Division Woman and Baby, University Medical Centre Utrecht, Utrecht, The Netherlands.
3 Centre for Quality and Management in Health Care, Medical Association of Lower Saxony, Hannover, Germany.
4 Department of Obstetrics, Rigshospitalet, University Hospital of Copenhagen, Copenhagen, Denmark.
5 Université Paris Cité, Obstetrical, Perinatal and Paediatric Epidemiology Research Team (EPOPé), Centre for Epidemiology and Statistics, Inserm U1153, Paris, France.
6 National Centre for Disease Prevention and Health Promotion, Istituto Superiore di Sanità-(Italian National Institute of Health), Rome, Italy.
7 Department of Knowledge Brokers, THL Finnish Institute for Health and Welfare, Helsinki, Finland.
8 Department of Molecular Medicine and Surgery, Karolinska Institute, Stockholm, Sweden.
9 Academic Primary Health Care Centre, Stockholm, Sweden.
10 National Perinatal Epidemiology Unit, University of Oxford, Oxford, UK.
11 Department of Clinical Science and Education, Karolinska Institute, Södersjukhuset, Stockholm, Sweden.
12 Department of Obstetrics and Gynaecology, Södersjukhuset, Stockholm, Sweden.
13 Department of Gynaecology and Obstetrics, Clinic Ottakring, Vienna Healthcare Group, Vienna, Austria.
14 Athena Institute, VU University Amsterdam, Amsterdam, The Netherlands.
15 Department of Obstetrics, Leiden University Medical Centre, Leiden, The Netherlands.
16 Department of Obstetrics and Gynaecology, Deventer Hospital, Deventer, The Netherlands.