“…Six studies were conducted in Asia [ 33 , 34 , 35 , 36 , 37 , 38 ], three in Europe and two in Africa [ 39 , 40 , 41 , 42 , 43 ]. Six studies were from high TB burden countries [ 33 , 34 , 37 , 38 , 39 , 40 ], two from middle TB burden countries [ 35 , 36 ] and three from low TB burden countries [ 41 , 42 , 43 ]. Five studies were of a randomized controlled trial (RCT) design [ 33 , 34 , 37 , 38 , 40 ], three were prospective studies [ 35 , 39 , 42 ], two were case-control studies [ 41 , 43 ], and one was a cross-sectional study [ 36 ].…”