@misc{indiciae74b189e84359,
  title = {Progesterone and preterm birth.},
  author = {Francine H Einstein and Luis A Bracero},
  year = {2004},
  doi = {10.1016/j.ajog.2003.12.045},
  url = {https://pubmed.ncbi.nlm.nih.gov/15290819/},
  note = {Source identifier: 15290819}
}