@misc{9443,
  author = {A. Nicholson and E. Ford and K. Davies and H. Smith and G. Rait and A. Tate and I. Petersen and J. Cassell},
  title = {Optimising use of electronic health records to describe the presentation of rheumatoid arthritis in primary care: a strategy for developing code lists},
  year = {2013},
  journal = {PLoS One},
  volume = {8},
  number = {2},
  pages = {e54878},
  issn = {1932-6203},
  doi = {10.1371/journal.pone.0054878},
}