1. Department of Obstetrics and GynecologyHaukeland University Hospital Bergen Norway
2. Department of Clinical SciencesUniversity of Bergen Bergen Norway
3. Department of Health Care Science Ersta Sköndal Bräcke University College StockholmSweden
4. Research Unit Womens and Childrens Health Department Copenhagen Denmark
5. Department of GynaecologyRigshospitalet, Copenhagen University Hospital Copenhagen Denmark
6. AU LibraryHealth Sciences Aarhus University Aarhus C Denmark
7. Department of Gynecology and Obstetrics Aarhus University Hospital Aarhus N Denmark