@misc{indiciae9a0148859f9c,
  title = {Low-dose progestogens and ectopic pregnancy.},
  author = {R Corcoran and M W Rizk},
  year = {1977},
  doi = {10.1136/bmj.1.6060.578-b},
  url = {https://pubmed.ncbi.nlm.nih.gov/843821/},
  note = {Source identifier: 843821}
}