External sources• UNDP/UNFPA/WHO/World Bank (HRP), Switzerland.• The University of Liverpool, UK.NIHR NHS Cochrane Collaboration Programme Grant Scheme award for NHS-prioritised centrally-managed, pregnancy and childbirth systematic reviews: CPGS02
DIFFERENCES BETWEEN PROTOCOL AND REVIEWWe have used fixed-effect Mantel-Haenszel meta-analysis for combining data because the Handbook suggests it is more commonly used (Higgins 2008). We have modified the wording in the methods sections for Assessment of heterogeneity, Assessment of reporting biases and Data synthesis to update them with the new methods being used by the group, developed in conjunction with the Group's Statistician, Simon Gates, and Richard Riley. We have used these new methods in the review.