1. Periconceptional Epidemiology, Department of Obstetrics and Gynaecology, University Medical Center Rotterdam, 3015 MC GE Rotterdam, The Netherlands
2. Molecular Epidemiology, Department of Biomedical Data Sciences, Leiden University Medical Center, Leiden 2300RC, The Netherlands
3. Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm 171 77, Sweden
4. Pediatric Allergy and Pulmonology Unit, Astrid Lindgren Children’s Hospital, Stockholm 171 76, Sweden
5. Department of Clinical Sciences, Danderyd Hospital, Karolinska Institutet, Stockholm 182 88, Sweden
6. Carl von Linné Clinic, Uppsala, Sweden
7. Department of Women's and Children's Health, Uppsala University, Uppsala 751 85, Sweden
8. Center for Reproductive Biology in Uppsala, University of Agricultural Sciences and Uppsala University, Uppsala, Sweden
9. Department of Women's and Children's Health, Karolinska Institutet, Stockholm 171 77, Sweden
10. S:t Görans Sjukhus, Livio Fertilitetscentrum Kungsholmen, Stockholm 112 81, Sweden
11. Livio Fertilitetscentrum Gärdet Storängsvägen 10, Stockholm 115 42, Sweden
12. Institute of Environmental Medicine, Karolinska Institutet, Stockholm 171 77, Sweden