affiliation not provided to SSRN, University of Groningen - Department of Epidemiology, PALGA, the Nationwide Network and Registry of Histo- and Cytopathology in the Netherlands, University of Groningen - Department of Pathology and Medical Biology, University of Groningen - University Medical Center Groningen (UMCG), University of Groningen - Department of Epidemiology and University of Groningen - Department of Epidemiology