@misc{indiciae862a4a3ebbcd,
  title = {Contraception for sicklers.},
  author = {R P Perkins},
  year = {1971},
  doi = {10.1056/nejm197107292850523},
  url = {https://pubmed.ncbi.nlm.nih.gov/5090407/},
  note = {Source identifier: 5090407}
}