1 Department of Registration, Cancer Registry of Norway, Norwegian Institute of Public Health, Oslo, Norway; Oslo Centre for Biostatistics and Epidemiology, Department of Biostatistics, Institute of Basic Medical Sciences, University of Oslo, Norway. silr@kreftregisteret.no.
2 Oslo Centre for Biostatistics and Epidemiology, Oslo University Hospital, Oslo, Norway.
3 Oslo Centre for Biostatistics and Epidemiology, Oslo University Hospital, Oslo, Norway; Department of Research, Cancer Registry of Norway, Norwegian Institute of Public Health, Oslo, Norway; Institute for Cancer Research, Oslo University Hospital, Oslo, Norway.
4 Oslo Centre for Biostatistics and Epidemiology, Department of Biostatistics, Institute of Basic Medical Sciences, University of Oslo, Norway.