@misc{9928,
  author = {K. Jordan and A. Clarke and D. Symmons and D. Fleming and M. Porcheret and U. Kadam and P. Croft},
  title = {Measuring disease prevalence: a comparison of musculoskeletal disease using four general practice consultation databases},
  year = {2007},
  journal = {Br J Gen Pract},
  volume = {57},
  number = {534},
  pages = {7-14},
  issn = {0960-1643 (Print) 0960-1643},
}