TY  - RPRT
TI  - Re: Fentanyl, morphine, and constipation.
AU  - A Davies
AU  - W Prentice
PY  - 1998
DO  - 10.1016/s0885-3924(98)00062-1
UR  - https://pubmed.ncbi.nlm.nih.gov/9769615/
ID  - 9769615
ER  -