We searched the Cochrane Pregnancy and Childbirth Group’s Trials Register (30 June 2011), the Cochrane Central Register of
Controlled Trials (CENTRAL) (The Cochrane Library 2011, Issue 2 of 4), MEDLINE (1966 to 30 June 2011), CINAHL (1980 to 30
June 2011), the Australian and New Zealand Clinical Trial Registry (30 June 2011), Chinese Clinical Trial Register (30 June 2011),
Current Controlled Trials (30 June 2011), ClinicalTrials.gov, (30 June 2011) ISRCTN Register (30 June 2011), National Centre for
Complementary and Alternative Medicine (NCCAM) (30 June 2011) and the WHO International Clinical Trials Registry Platform
(30 June 2011).
We searched the Cochrane Pregnancy and Childbirth Group’s Trials Register (30 June 2011), the Cochrane Central Register ofControlled Trials (CENTRAL) (The Cochrane Library 2011, Issue 2 of 4), MEDLINE (1966 to 30 June 2011), CINAHL (1980 to 30June 2011), the Australian and New Zealand Clinical Trial Registry (30 June 2011), Chinese Clinical Trial Register (30 June 2011),Current Controlled Trials (30 June 2011), ClinicalTrials.gov, (30 June 2011) ISRCTN Register (30 June 2011), National Centre forComplementary and Alternative Medicine (NCCAM) (30 June 2011) and the WHO International Clinical Trials Registry Platform(30 June 2011).
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