@misc{9406,
  author = {Y. Vinogradova and C. Coupland and J. Hippisley-Cox},
  title = {Exposure to bisphosphonates and risk of gastrointestinal cancers: series of nested case-control studies with QResearch and CPRD data},
  year = {2013},
  journal = {Bmj},
  volume = {346},
  pages = {f114},
  issn = {0959-8138},
  doi = {10.1136/bmj.f114},
}