@misc{indiciae11008e4c110d,
  title = {Epidural opioid selection.},
  author = {J Chrubasik and E Martin and S Chrubasik and G Friedrich},
  year = {1993},
  doi = {10.1213/00000539-199303000-00062},
  url = {https://pubmed.ncbi.nlm.nih.gov/8507257/},
  note = {Source identifier: 8507257}
}