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It is one of health care’s most vexing quandaries: Patient data must be shared to develop more effective medicines and artificial intelligence tools, but there’s no way to share it without violating privacy and basic data rights.

Or is there?

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A fresh crop of companies is building a new data economy that enables the shared use of personal health information while enforcing ironclad privacy protections. They are not a monolithic group: each one uses its own methods and technologies, serves different customers, and is motivated by distinct problems and personal philosophies.

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