@misc{indiciae6ed40984191f,
  title = {Opioid plasma levels during labour.},
  author = {F Facchinetti and G Centini and D Parrini and F Petraglia and N D'Antona and E V Cosmi and A R Genazzani},
  year = {1982},
  doi = {10.1159/000299509},
  url = {https://pubmed.ncbi.nlm.nih.gov/6284596/},
  note = {Source identifier: 6284596}
}