@misc{9509,
  author = {I. Douglas and S. Evans and A. Hingorani and A. Grosso and A. Timmis and H. Hemingway and L. Smeeth},
  title = {Clopidogrel and interaction with proton pump inhibitors: comparison between cohort and within person study designs},
  year = {2012},
  journal = {Bmj},
  volume = {345},
  pages = {e4388},
  issn = {0959-8138},
  doi = {10.1136/bmj.e4388},
}