“…Twenty five studies were conducted in Sub-Saharan Africa [42]–[66], six in Latin America-Caribbean [41], [67]–[71], nine in Asia [72]–[80], and one in Ukraine [81]. Of the 41 included studies, 17 described PMTCT programs in low-income [46]–[50], [52]–[55], [57]–[59], [61]–[63], [67], [80], 15 in lower-middle income [41], [43]–[45], [56], [64], [65], [70], [72], [74], [76]–[79], [81], and nine in upper-middle income countries [42], [51], [60], [66], [68], [69], [71], [73], [75].…”