@misc{indiciae31feba35ac3c,
  title = {Hormonal contraception.},
  author = {R B Shearin and J R Boehlke},
  year = {1989},
  doi = {10.1016/s0031-3955(16)36692-5},
  url = {https://pubmed.ncbi.nlm.nih.gov/2660092/},
  note = {Source identifier: 2660092}
}