A leading US health system is not disclosing how many patients' medical records were effected by what could be the largest medical cyberattack in US history.CommonSpirit Health, the nation's fourth largest system with 142 hospitals across 21 states, was the target of a major IT ransomware attack last week.The firm holds the medical records of up to 20million Americans, all of which may have been affected by the attack - which the firm is calling an 'IT security issue'.
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