@misc{10321,
  author = {H. Jick},
  title = {Incidence of venous thromboembolism in users of combined oral contraceptives. Methods for identifying cases and estimating person time at risk must be detailed},
  year = {2000},
  journal = {Bmj},
  volume = {320},
  number = {7226},
  pages = {57-8},
  issn = {0959-8138 (Print) 0959-8138},
}