Comparative review reveals procedural and classification differences across Nordic cancer registries, highlighting the need for caution when analyzing regional time trends.
Even though the information in the Nordic Cancer Registries in general can be considered more similar than any other collection of data from five different countries, there are numerous differences in registration routines, classification systems and inclusion of some tumors. These differences are important to be aware of when comparing time trends in the Nordic countries.
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Pukkala et al. (2017) studied this question.
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