The question is how anonymous is your data once stripped of ‘personal identifying information’ (PII) when used by data aggregation companies for analysis. PII can include name, postcode, etc. I made a couple of blog posts in 2008 concerning this. According to a study led by the Children’s Hospital of Eastern Ontario, previously anonymised data were able to be correlated again from patient prescription records rending the anonymising process ineffective and a threat to patient privacy.
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