1. From the Clinical Effectiveness Research Group (M. Bretthauer, M.L., P.W., M.K., K.G., M. Bugajski, Ø.H., H.-O.A., M.F.K.) and the Department of General Practice, Institute of Health and Society (L.E.), University of Oslo, the Clinical Effectiveness Research Group, Department of Transplantation Medicine, Oslo University Hospital (M. Bretthauer, M.L., M.K., K.G., Ø.H., H.-O.A.), and the Cancer Registry of Norway (G.H.), Oslo, the Institute of Clinical Medicine, University of Tromsø, Tromsø (M. Bretthauer)...