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. Author manuscript; available in PMC: 2014 Nov 16.
Published in final edited form as: Cochrane Database Syst Rev. 2010 Sep 8;(9):CD007396. doi: 10.1002/14651858.CD007396.pub2

Analysis 5.1. Comparison 5 Tramadol versus pethidine, Outcome 1 Pain intensity: women with poor pain relief.

Review: Parenteral opioids for maternal pain management in labour

Comparison: 5 Tramadol versus pethidine

Outcome: 1 Pain intensity: women with poor pain relief

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