“…Seven unique studies had large sample sizes ( N >900): four studies with the same orphaned, vulnerable children and comparison children were conducted in China [31–34], and three were conducted in Africa [10,15,25]. Five of the studies focused on HIV-affected children [10,25,27,31,37], nine focused on HIV-infected children [16,19,21,23,24,26,28,29,36] and eight focused on comparing groups of HIV/AIDS orphans, orphans from other illnesses and vulnerable children [9,20,22,30,32–35]. …”