@misc{indiciae662d69f03ad0,
  title = {Persistently increased morphine-6-glucuronide concentrations.},
  author = {M A Calleja and D Childs and R F Venn and A Michalkiewicz},
  year = {1990},
  doi = {10.1093/bja/64.5.649-a},
  url = {https://pubmed.ncbi.nlm.nih.gov/2354106/},
  note = {Source identifier: 2354106}
}