“…Two were randomised controlled trials [ 21 , 22 ]; three cluster randomised trials [ 23 – 25 ] and one reporting three year follow-up results of a cluster randomised trial [ 26 ]; eight pre-post studies [ 27 – 34 ]; 25 cross sectional studies [ 35 – 59 ]; two qualitative studies [ 60 , 61 ] and one mixed method study [ 62 ]. Sixteen countries; Bangladesh (n = 2) [ 28 , 59 ]; Brazil (n = 10) [ 45 , 49 , 50 , 53 – 57 , 60 , 61 ]; Burkina Faso(n = 1) [ 44 ]; Burundi (n = 1) [ 30 ]; Cambodia (n = 1) [ 31 ]; The Gambia (n = 1) [ 62 ];Indonesia (n = 7) [ 23 , 25 , 34 , 36 , 46 , 47 , 52 ]; Kenya (n = 3) [ 39 , 40 , 48 ]; Lebanon(n = 1) [ 43 ]; Malawi(n = 1) [ 58 ]; Mongolia(n = 3) [ 24 , 26 , 35 ]; Nigeria (n = 1) [ 51 ];Pakistan(n = 2) [ 21 , 22 ]; Palestine(n = 2) [ 29 , 37 ]; South Africa (n = 4) [ 32 , 38 , 41 , ...…”