@misc{9752,
  author = {N. Khan and S. Harrison and P. Rose},
  title = {Validity of diagnostic coding within the General Practice Research Database: a systematic review},
  year = {2010},
  journal = {Br J Gen Pract},
  volume = {60},
  number = {572},
  pages = {128-36},
  issn = {0960-1643},
  doi = {10.3399/bjgp10X483562},
}