@misc{indiciaec4b143933774,
  title = {Re: Fentanyl, morphine, and constipation.},
  author = {A Davies and W Prentice},
  year = {1998},
  doi = {10.1016/s0885-3924(98)00062-1},
  url = {https://pubmed.ncbi.nlm.nih.gov/9769615/},
  note = {Source identifier: 9769615}
}