“…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]. The presented PMTCT programs were implemented at different time periods between years 1997 and 2006 (Figure S1).…”