1. Department of Nutrition, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway.
2. Department of Oncology, Oslo University Hospital, Oslo, Norway.
3. Oslo and Akershus University College, Lillestrøm, Norway.
4. The Norwegian Research Council, Oslo, Norway.
5. Department of Community Medicine, Faculty of Health Sciences, University of Tromsø, Tromsø, Norway.
6. Department of Microbiology and Infection Control, University Hospital North Norway, Tromsø, Norway.
7. Department of Obstetrics and Gynecology, University of Rochester, Rochester, New York.
8. Department of Epidemiology and Population Studies, Jagiellonian University, Collegium Medicum, Krakow, Poland.
9. Department of Human Evolutionary Biology, Harvard University, Cambridge, Massachusetts.