@misc{9831,
  author = {D. Gunnell and D. Irvine and L. Wise and C. Davies and R. Martin},
  title = {Varenicline and suicidal behaviour: a cohort study based on data from the General Practice Research Database},
  year = {2009},
  journal = {Bmj},
  volume = {339},
  pages = {b3805},
  issn = {0959-8138},
  doi = {10.1136/bmj.b3805},
}