“…Of the 14 included studies, three (SADHS 2016, SANHANES 2012, and NFCS 2005) [ 18 , 19 , 20 ] were national surveys conducted across South African geographic locations and provinces. Of the remaining studies, seven were regional surveys [ 29 , 30 , 31 , 32 , 33 , 34 , 35 ], and four were cohort studies [ 36 , 37 , 38 , 39 ]. More than 50% were conducted among rural populations [ 29 , 30 , 31 , 32 , 33 , 36 ], while five studies were from urban settings [ 34 , 35 , 37 , 38 , 39 ].…”