@misc{indiciae9866c2b10ecf,
  title = {When to begin contraception after pregnancy.},
  author = {J O Greenhalf},
  year = {1973},
  doi = {10.1016/s0140-6736(73)90545-x},
  url = {https://pubmed.ncbi.nlm.nih.gov/4122579/},
  note = {Source identifier: 4122579}
}