TY - JOUR T1 - NHS ransomware attack spreads worldwide JF - Canadian Medical Association Journal JO - CMAJ SP - E786 LP - E787 DO - 10.1503/cmaj.1095434 VL - 189 IS - 22 AU - Roger Collier Y1 - 2017/06/05 UR - http://www.cmaj.ca/content/189/22/E786.abstract ER -