@misc{9416,
  author = {S. Brilleman and S. Purdy and C. Salisbury and F. Windmeijer and H. Gravelle and S. Hollinghurst},
  title = {Implications of comorbidity for primary care costs in the UK: a retrospective observational study},
  year = {2013},
  journal = {Br J Gen Pract},
  volume = {63},
  number = {609},
  pages = {274-82},
  issn = {0960-1643},
  doi = {10.3399/bjgp13X665242},
}