@misc{9829,
  author = {R. Tannen and M. Weiner and D. Xie},
  title = {Use of primary care electronic medical record database in drug efficacy research on cardiovascular outcomes: comparison of database and randomised controlled trial findings},
  year = {2009},
  journal = {Bmj},
  volume = {338},
  pages = {b81},
  issn = {0959-8138},
  doi = {10.1136/bmj.b81},
}