@misc{9819,
  author = {M. Gulliford and J. Charlton and M. Ashworth and A. Rudd and A. Toschke},
  title = {Selection of medical diagnostic codes for analysis of electronic patient records. Application to stroke in a primary care database},
  year = {2009},
  journal = {PLoS One},
  volume = {4},
  number = {9},
  pages = {e7168},
  issn = {1932-6203},
  doi = {10.1371/journal.pone.0007168},
}