1. Amsterdam University Medical Centers, University of Amsterdam, Department of Obstetrics and Gynecology, Amsterdam Reproduction & Development Research Institute, Amsterdam, The Netherlands
2. Department of Clinical Epidemiology, Biostatistics and Bioinformatics, Amsterdam University Medical Centers, University of Amsterdam, Amsterdam, The Netherlands
3. Pregnancy Sickness Support, Bodmin, UK
4. Department of Obstetrics and Gynecology, Noordwest Ziekenhuisgroep, Alkmaar, The Netherlands
5. Laboratory of Reproductive Biology, Amsterdam University Medical Centers, University of Amsterdam, Amsterdam, The Netherlands
6. Department of Obstetrics and Gynecology, Reinier de Graaf Hospital, Delft, The Netherlands
7. Department of Obstetrics and Gynecology, Martini Hospital, Groningen, The Netherlands
8. Department of Obstetrics and Gynecology, Radboud University Medical Center, Nijmegen, The Netherlands
9. Department of Obstetrics and Gynecology, Gelre Hospital, Apeldoorn, The Netherlands
10. Department of Obstetrics and Gynecology, Flevo Hospital, Almere, The Netherlands
11. Department of Obstetrics and Gynecology, Catharina Hospital, Eindhoven, The Netherlands
12. Department of Obstetrics and Gynecology, Máxima Medical Center, Veldhoven, The Netherlands
13. Department of Obstetrics and Gynecology, Zuyderland Hospital, Heerlen, The Netherlands
14. Department of Obstetrics and Gynecology, Franciscus Gasthuis, Rotterdam, The Netherlands
15. Department of Obstetrics and Gynecology, Amphia Hospital, Breda, The Netherlands
16. Department of Obstetrics and Gynecology, Scheper Hospital, Emmen, The Netherlands
17. Department of Obstetrics and Gynecology, Spaarne Gasthuis, Haarlem, The Netherlands
18. Department of Obstetrics and Gynecology, OLVG, Amsterdam, The Netherlands
19. Department of Obstetrics and Gynecology, Jeroen Bosch Hospital, 's-Hertogenbosch, The Netherlands
20. Department of Obstetrics and Gynecology, Maastricht University Medical Center, Maastricht, The Netherlands
21. Department of Obstetrics and Gynecology, Diakonessenhuis, Utrecht, The Netherlands
22. Department of Obstetrics and Gynecology, Monash University, Clayton, Australia
23. Department of Psychiatry, Amsterdam University Medical Centers, University of Amsterdam, Amsterdam, The Netherlands
24. ARQ National Psychotrauma Centre, Diemen, The Netherlands