1. Julius Centre for Health Sciences and Primary Care; University Medical Centre Utrecht; Utrecht the Netherlands
2. Department of Obstetrics and Gynaecology; Academic Medical Centre Amsterdam; Amsterdam the Netherlands
3. MRC Centre for Reproductive Health; University of Edinburgh; Edinburgh UK
4. Centre of Foetal Medicine 4002; Copenhagen University Hospital; Rigshospitalet; Copenhagen Denmark
5. Department of Obstetrics and Gynaecology; Alpert Medical School; Brown University; Providence RI USA
6. Department of Obstetrics and Gynecology; American University of Beirut Medical Center; Beirut Lebanon
7. Maternal-Fetal Medicine Unit; Instituto Valenciano de Infertilidad; University of Valencia; Valencia Spain
8. Obstetrix Medical Group; San Jose CA USA
9. Department of Obstetrics and Gynaecology; CHU Toulouse and Inserm UMR1027; University Toulouse III; Toulouse France
10. The Egyptian IVF Centre; Maadi Cairo Egypt
11. Department of Obstetrics and Gynaecology and Community Health Sciences; University of Calgary; Calgary AB Canada
12. Department of Obstetrics and Gynaecology; Zeynep Kamil Women and Children Diseases Education and Research Hospital; Uskudar Istanbul Turkey
13. Department of Obstetrics and Gynaecology; Willis Knighton Medical Centre; Shreveport LA USA
14. Departamento de Obstetrícia e Ginecologia; Hospital do Servidor Publico Estadual; ‘Francisco Morato de Oliveira’ and School of Medicine; University of São Paulo; São Paulo Brazil
15. Department of Obstetrics and Fetomaternal Medicine; Medical University of Vienna; Vienna Austria
16. The Biostatistics Centre; George Washington University; Rockville MD USA
17. Department of Obstetrics and Gynaecology; Magee-Womens Hospital; University of Pittsburgh; Pittsburgh PA USA
18. Department of Obstetrics and Gynaecology; University Hospital La Fe; Valencia Spain
19. Departamento de Obstetricia y Ginecología; Hospital Universitario Virgen de la Arrixaca; Murcia Spain
20. Obstetrix Medical Group; The Centre for Research, Education & Quality (CREQ); Fountain Valley CA USA
21. Obstetrix Medical Group; The Centre for Research, Education & Quality (CREQ); Steamboat Springs CO USA
22. Department of Obstetrics and Gynecology; University of Mississippi Medical Center; Jackson MS USA
23. Department of Obstetrics and Gynecology; University of Arkansas for Medical Sciences; Little Rock AR USA
24. Department of Obstetrics and Gynaecology; King's College Hospital; London UK
25. Department of Obstetrics; University Medical Centre Utrecht; Utrecht the Netherlands
26. The Robinson Institute; School of Paediatrics and Reproductive Health; University of Adelaide; Adelaide SA Australia