Imho there is no such thing as anonymized health care data. If the data is meaningful each dataset contains enough bits of information to de-anoymize the data w

Imho there is no such thing as anonymized health care data. If the data is meaningful each dataset contains enough bits of information to de-anoymize the data when combined with other data sets. This makes Google especially dangerous as they have already much or all of the data required for de-anonymization. Patient consent would make the data much less meaningful as it would remove datasets in a non-random way (better educated people might more likely opt-out). So that's no good solution either. I had recently a doctors visit and was asked exactly that. I opted out as I have no control over the data when released.