@misc{indiciae9414638f0c23,
  title = {Use-effectiveness in contraception.},
  author = {W H James},
  year = {1972},
  doi = {10.1016/s0140-6736(72)92675-x},
  url = {https://pubmed.ncbi.nlm.nih.gov/4117830/},
  note = {Source identifier: 4117830}
}