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LONDON, ENGLAND - MAY 12: A message informing visitors of a cyber attack is displayed on the NHS website on May 12, 2017 in London, England. NHS hospitals across England have been hit by a large-scale cyber-attack with many hospitals having to divert emergency patients and doctors reporting messages demanding money. (Photo by Carl Court/Getty Images)

LONDON, ENGLAND - MAY 12:  A message informing visitors of a cyber attack is displayed on the NHS website on May 12, 2017 in London, England. NHS hospitals across England have been hit by a large-scale cyber-attack with many hospitals having to divert emergency patients and doctors reporting messages demanding money.  (Photo by Carl Court/Getty Images)