TY  - RPRT
TI  - Methodologic issues in assessing the active management of labor.
AU  - W Fraser
PY  - 1993
DO  - 10.1111/j.1523-536x.1993.tb00441.x
UR  - https://pubmed.ncbi.nlm.nih.gov/8240624/
ID  - 8240624
ER  -