1. Department of Obstetrics and Gynecology; University of Rochester School of Medicine and Dentistry; Rochester New York
2. Department of Biostatistics; University of Rochester School of Medicine and Dentistry; Rochester New York
3. The Cancer Center; Oslo University Hospital; Oslo Norway
4. Department of Human Evolutionary Biology; Harvard University; Cambridge Massachusetts
5. Department of Community Medicine; Faculty of Health Sciences; University of Tromsø; Tromsø Norway