1. Department of Obstetrics and Gynaecology, Hvidovre Hospital University of Copenhagen Hvidovre Denmark
2. Department of Clinical Medicine University of Copenhagen Copenhagen Denmark
3. Department of Clinical Microbiology Hvidovre Hospital University of Copenhagen Hvidovre Denmark
4. Cryos International Aarhus Denmark
5. Department of Biostatistics University of Copenhagen Copenhagen Denmark
6. Department of Growth and Reproduction Rigshospitalet University of Copenhagen Copenhagen Denmark