1. Institute of Clinical Medicine; University of Oslo; Oslo Norway
2. Research Center for Obstetrics and Gynecology; Oslo University Hospital; Oslo Norway
3. National Resource Center for Rehabilitation in Rheumatology; Diakonhjemmet Hospital; Oslo Norway
4. Oslo Center for Biostatistics and Epidemiology; Oslo University Hospital; Oslo Norway
5. Institute of Health and Society; University of Oslo; Oslo Norway
6. Department of Transplantation Medicine; Oslo University Hospital; Oslo Norway
7. Department of Reproductive Medicine; Oslo University Hospital; Oslo Norway
8. Department of Gynecology; Oslo University Hospital; Oslo Norway