Use of premixed pethidine and antagonists in obstetrical analgesia; with special reference to cases in which levallorphan was used
- PMID: 13805887
- PMCID: PMC1990381
- DOI: 10.1136/bmj.2.5156.859
Use of premixed pethidine and antagonists in obstetrical analgesia; with special reference to cases in which levallorphan was used
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