Information compiled by data brokers from public records and credit card transactions can reveal where a person shops, the food they buy, and whether they smoke. The largest hospital chain in the Carolinas is plugging data for 2 million people into algorithms designed to identify high-risk patients, while Pennsylvania’s biggest system uses household and demographic data. Patients and their advocates, meanwhile, say they’re concerned that big data’s expansion into medical care will hurt the doctor-patient relationship and threaten privacy."
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