1. Department of Obstetrics and Gynecology; Karolinska University Hospital; Stockholm Sweden
2. Department of Clinical Science Intervention and Technology; Karolinska Institutet; Stockholm Sweden
3. Division of Women's Health; Women's Health Academic Centre; King's Health Partners; King's College London; Guy's and St Thomas' NHS Foundation Trust; London UK
4. Department of Clinical Immunology and Transfusion Medicine; Karolinska University Hospital; Stockholm Sweden
5. Department of Laboratory Medicine; Karolinska Institutet; Stockholm Sweden