“…The twenty-four studies [ 1 , 3 , 6 , 7 , 9 , 11 , 12 , 14 , 18 , 21 – 26 , 28 , 29 , 31 , 38 – 43 ] and two studies [ 10 , 44 ] were conducted using cross-sectional and retrospective cohort study designs respectively. Regarding geographical region, nineteen studies were found in Ethiopia [ 1 , 3 , 6 , 9 , 10 , 14 , 18 , 21 , 22 , 24 , 26 , 28 , 38 – 44 ], one study in Kenya [ 23 ], Nigeria [ 7 ], Cameroon [ 12 ], Sudan [ 25 ], South Africa [ 31 ], Tanzania [ 11 ], and selected SSA countries [ 29 ]. The total sample size of the included studies was 11,600, where the smallest sample size was 131 in Ethiopia (Jimma University Medical Center) and the largest sample size was 2,198 in selected SSA countries.…”