“…Online Appendix 1 shows the characteristics of the included studies, revealing that 16 of the 39 studies in this review were from Ethiopia, 15 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 11 from Nigeria, 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 four from Kenya, 55 , 56 , 57 , 58 two from Sudan, 59 , 60 two from Zimbabwe, 61 , 62 one from Malawi, 63 one from South Africa, 64 one from Swaziland 65 and one from Zambia. 66 …”