Oslo University Hospital is a highly specialised hospital in charge of extensive regional and local hospital assignments and the provision of high-quality services for the citizens of Oslo. The hospital also has several national centres of competence, including the Cancer Registry of Norway – Institute for population-based cancer research (CRN) which has collected high quality data on all new cancer cases in Norway; runs 3 national cancer screening programs (for breast, cervix, and colon); and performs etiological and clinical cancer epidemiology at the national and the international level.