DOI:
10.1055/s-00000095
Zeitschrift für Geburtshilfe und Neonatologie
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References
Ullman R, Smith LA, Burns E. et al.
Parenteral opioids for maternal pain relief in labour.
The Cochrane Database of Systematic Reviews 2010;
DOI: 10.1002/14651858.CD007396.pub2.
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