More than 100 million individuals had their private health information stolen during the ransomware attack on Change Healthcare in February, a cyberattack that caused months of unprecedented outages and widespread disruption across the U.S. healthcare sector.This is the first time that UnitedHealth Group, the U.S. health insurance provider that owns the health tech company, has put a number of affected individuals to the data breach, after previously saying it anticipated the breach to include data on a “su ...