“…[9,[27][28][29][30][31]35,37,39,40,46,48] There were four (10.0%) prospective studies, [38,42,47,49] all of which were published in the last three and a half decades of the study. Eleven emanated from Nigeria, [11,20,23,26,31,[33][34][35]43,45,48] 6 (15.0%) from South Africa, [15,18,24,29,37,39] 5 (12.5%) from Egypt, [32,38,42,47,49] 4 (10.0%) each from Tanzania [9,17,28,44] and Zimbabwe, [12,13,21,22] 3 (7.5%) from Uganda, [14,16,19] 2 (5.0%) each from Cameroon, [41,…”