@misc{indiciaea9b701681d2b,
  title = {Low-dosage oral progestogen.},
  author = {W P Black},
  year = {1968},
  doi = {10.1136/bmj.2.5604.562-a},
  url = {https://pubmed.ncbi.nlm.nih.gov/5724468/},
  note = {Source identifier: 5724468}
}