“…15,16,17,19,21,24,25,26,28,29,30,32,34,38,39,40,41,49,50,52,54,55,56 As Figure 2 shows, 17 studies were performed in Africa, 14,15,16,19,20,21,22,26,28,29,30,34,36,46,48,49,50,57 12 studies in Oceania, 27,33,35,37,39,42,43,44,45,53,56 and 12 studies in Asia .…”