@misc{8912,
  author = {A. Boef and P. Souverein and J. Vandenbroucke and van Vlieg and A. de Boer and S. le Cessie and O. Dekkers},
  title = {Instrumental variable analysis as a complementary analysis in studies of adverse effects: venous thromboembolism and second-generation versus third-generation oral contraceptives},
  year = {2016},
  journal = {Pharmacoepidemiol Drug Saf},
  volume = {25},
  number = {3},
  pages = {317-24},
  issn = {1053-8569},
  doi = {10.1002/pds.3956},
}