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Hutton EK, Kasperink M, Rutten M, Reitsma A, Wainman B (August 2009). "Sterile water injection for labour pain: a systematic review and meta-analysis of randomised controlled trials". BJOG. 116 (9): 1158–1166. doi:10.1111/j.1471-0528.2009.02221.x. PMID19459860. S2CID19914146.
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Hutton EK, Kasperink M, Rutten M, Reitsma A, Wainman B (August 2009). "Sterile water injection for labour pain: a systematic review and meta-analysis of randomised controlled trials". BJOG. 116 (9): 1158–1166. doi:10.1111/j.1471-0528.2009.02221.x. PMID19459860. S2CID19914146.