[1] University of Bergen,Department of Global Public Health and Primary Care
[2] Kalfarveien 31,Department of Obstetrics and Gynecology
[3] Bergen N-5018,Department of Epidemiology Research
[4] Norway,Department of Clinical Medicine
[5] Haukeland University Hospital,Department of Medicine
[6] Center for Medical Genetics and Molecular Medicine,undefined
[7] Haukeland University Hospital,undefined
[8] National Health Surveillance and Research,undefined
[9] Statens Serum Institut,undefined
[10] University of Copenhagen,undefined
[11] Stanford University School of Medicine,undefined
[12] Cancer Registry of Norway,undefined
[13] Norwegian Institute of Public Health,undefined