“…Of the 63 studies included in the review, there were 32 randomised controlled trials (from 33 publications),24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56 11 cluster randomised trials,57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67 and 20 before-and-after studies68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87 (appendix pp 3–38). 50 studies were done in Asia and Africa.…”