Comparative effectiveness research in cancer screening programmes

I am curious about the absence of discussion concerning consent. How does the study deal with generally accepted principles, such as WHO Good Clinical Practice Principle 7 ("Freely given informed consent should be obtained from every subject prior to research participation in accordance with national culture(s) and requirements.")? Has Norway ‘decided’ that its national culture is compatible with a doctrine of presumed or societal consent, rather than individual consent – at least for some health studies? Can we learn more about this?