“Every disadvantage has its advantage” ( ), says Johan Cruijff, the Netherlands’ greatest soccer player, in one of his most famous quotes. Every time completeness and accessibility of follow-up data in screening evaluation are in play, I am extremely conscious of this quote. It was under Napoleon Bonaparte, actually, that a population registry started in the Netherlands, in the same process by which he conquered large parts of Europe while leaving behind a path of destruction and death. On the positive side of this legacy, current registry systems that uniformly cover 100% of the actual population allow us to approach each individual and link follow-up data to them. Among other things, they help ensure high-quality cancer screening.
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