@misc{indiciaef0df11ff6ebf,
  title = {The new progestogens.},
  author = {M Elstein and E Eyong},
  year = {1989},
  doi = {10.1007/bf01890896},
  url = {https://pubmed.ncbi.nlm.nih.gov/2700421/},
  note = {Source identifier: 2700421}
}