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A randomised non-inferiority controlled trial of a single versus a four intradermal sterile water injection technique for relief of continuous lower back pain during labour

Nigel Lee*, Peter Coxeter, Michael Beckmann, Joan Webster, Vanessa Wright, Tric Smith and Sue Kildea

BMC Pregnancy and Childbirth 2011, 11:21  doi:10.1186/1471-2393-11-21