@misc{10339,
  author = {H. Jick and J. Kaye and C. Vasilakis-Scaramozza and S. Jick},
  title = {Risk of venous thromboembolism among users of third generation oral contraceptives compared with users of oral contraceptives with levonorgestrel before and after 1995: cohort and case-control analysis},
  year = {2000},
  journal = {Bmj},
  volume = {321},
  number = {7270},
  pages = {1190-5},
  issn = {0959-8138 (Print) 0959-8138},
}