TY  - RPRT
TI  - Systems modification in obstetric analgesia.
AU  - I D Levack
AU  - M E Tunstall
PY  - 1984
DO  - 10.1111/j.1365-2044.1984.tb09512.x
UR  - https://pubmed.ncbi.nlm.nih.gov/6703274/
ID  - 6703274
ER  -