@misc{indiciae586299542c4b,
  title = {Low-dose progestogens and ectopic pregnancy.},
  author = {R Corcoran and M W Rizk},
  year = {1977},
  doi = {10.1136/bmj.1.6057.378-b},
  url = {https://pubmed.ncbi.nlm.nih.gov/837112/},
  note = {Source identifier: 837112}
}