1. 1Medical Informatics, Biometry and Epidemiology and Institutes of
2. 3Hamburg Cancer Registry, State Ministry of Environment and Health, Hamburg, Germany;
3. 4Saarland Cancer Registry, Saarbrücken, Germany; and
4. 5Bremen Institute for Prevention Research and Social Medicine, Bremen, Germany
5. 2Pathology, University of Essen, Essen, Germany;