1. Clinical Epidemiology Unit; Department of Medicine - Solna; Karolinska Institute; Stockholm Sweden
2. Department of Women's and Children's Health; Karolinska Institute; Stockholm Sweden
3. Department of Clinical Sciences, Obstetrics and Gynecology; Umeå University; Umeå Sweden
4. Department of Healthcare Development; Public Health Care Services Committee; Stockholm County Council; Stockholm Sweden
5. Center for Fetal Medicine; Karolinska University Hospital; Stockholm Sweden
6. Department of Women's and Children's Health; Uppsala University; Uppsala Sweden