“…The remaining twenty-four articles were clinical studies. Eight studies were stated as prospective [ 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 ] and another eight were stated as retrospective [ 71 , 72 , 73 , 74 , 75 , 76 , 77 , 78 ], while the design of the other eight was not specified [ 79 , 80 , 81 , 82 , 83 , 84 , 85 , 86 ].…”