1. Department of Obstetrics and Gynecology Østfold Hospital Trust Grålum Norway
2. Department of Nursing and Health Promotion Faculty of Health Sciences Oslo Met—Oslo Metropolitan University Oslo Norway
3. Research Support Services Clinical Trial Unit Oslo University Hospital Oslo Norway
4. MOE‐Shanghai Key Lab of Children's Environmental Health Xinhua HospitalShanghai Jiaotong University School of Medicine Shanghai China
5. National Center for Fetal Medicine Trondheim University Hospital (St Olav's Hospital) Trondheim Norway
6. Department of Obstetrics and Gynecology Stavanger University Hospital Stavanger Norway
7. Norwegian National Advisory Unit on Women's Health Oslo University Hospital Oslo Norway
8. Department of Obstetrics and Gynecology University Hospital of North Norway Tromsø Norway