Abstract
Reason for withdrawal from publication This review is one part of a larger systematic review. The other part of the review will be published in the Campbell Collaboration Library of Systematic Reviews (http://www.campbellcollaboration.org/library.php). Both reviews are funded by the International Initiative for Impact Evaluation (3ie). A copy of the reviews will be published in the 3ie database of systematic reviews (http://www.3ieimpact.org/en/evidence/systematic-reviews/). Editorial Note 2 March 2017: This review was published in the Journal of Development Effectiveness, Volume 8, 2016.
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