@aral so… "opt in” would produce tiny numbers, and disproportionately miss (and therefore harm) the poor and socially excluded
@bengoldacre …I believe we can build a sustainable system that respects privacy rights. Would at the very least like to see this debated.
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@aral and the greatest benefits are banal everyday public health surveillance, causes and treatments of cancer etcThanks. Twitter will use this to make your timeline better. UndoUndo
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