@misc{indiciae3eae21d4fd72,
  title = {How preventable are unwanted pregnancies?},
  author = {J P Crawford},
  year = {1971},
  doi = {10.1016/s0140-6736(71)92723-1},
  url = {https://pubmed.ncbi.nlm.nih.gov/4101648/},
  note = {Source identifier: 4101648}
}