It seems possible that this prophetic British Medical Journal letter from May 10 edition (online May 11, the day before the WannaCry Exploit hit the world) may have focussed the current ransomware attack on UK NHS hospitals:

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The hackers holding hospitals to ransom | The BMJ

http://www.bmj.com/content/bmj/357/bmj.j2214.full.pdfhttp://www.bmj.com/content/bmj/357/bmj.j2214.full.pdf