Reference:
  Author: Julia Hippisley-Cox and Carol Coupland and Yana Vinogradova and John Robson and Rubin Minhas and Aziz Sheikh and Peter Brindle
  Title: "Predicting cardiovascular risk in England and Wales: prospective derivation and validation of QRISK2"
  Journal: British Medical Journal
  Year: 2008
  Volume: 336
  Number: 7659
  Pages: 1475-82
  DOI: 10.1136/bmj.39609.449676.25
  PMID: 18573856
  URL: http://www.bmj.com/content/336/7659/1475
  eprint: http://www.bmj.com/content/336/7659/1475.pdf%2Bhtml
