@misc{9399,
  author = {J. Quint and E. Herrett and K. Bhaskaran and A. Timmis and H. Hemingway and J. Wedzicha and L. Smeeth},
  title = {Effect of beta blockers on mortality after myocardial infarction in adults with COPD: population based cohort study of UK electronic healthcare records},
  year = {2013},
  journal = {Bmj},
  volume = {347},
  pages = {f6650},
  issn = {0959-8138},
  doi = {10.1136/bmj.f6650},
}