@misc{indiciae8f63236798c5,
  title = {Maternal oestriol levels reflect placental function rather than foetal function.},
  author = {L Perry and R Hickson and B C Obiekwe and T Chard},
  year = {1986},
  doi = {10.1530/acta.0.1110563},
  url = {https://pubmed.ncbi.nlm.nih.gov/2939681/},
  note = {Source identifier: 2939681}
}