“…After screening on titles, abstracts and full texts, forty comparative studies involving 4867,795 individuals were included in this review, in which eight are from the United States of America (USA), six are from South Korea, and four are from the United Kingdom (UK) ( Figure 1 ). 10 , 11 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 Twenty-eight (70%) of the included studies enrolled patients positive to SARS-CoV-2 tests. All forty studies included only adult cases.…”