@misc{indiciaecdc03644a2fa,
  title = {Progesterone concentration in human endometrium.},
  author = {H Grundsell and I Nilsson and S Nordqvist},
  year = {1973},
  doi = {10.1016/s0140-6736(73)91461-x},
  url = {https://pubmed.ncbi.nlm.nih.gov/4123439/},
  note = {Source identifier: 4123439}
}