@misc{indiciae785318b0451e,
  title = {Low-dose progestagens and ectopic pregnancy.},
  author = {R Corcoran and R Howard},
  year = {1977},
  doi = {10.1016/s0140-6736(77)91116-3},
  url = {https://pubmed.ncbi.nlm.nih.gov/63740/},
  note = {Source identifier: 63740}
}