How anonymous is your anonymised data?

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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