“…After reading full-text of the remaining 27 studies, another nine were excluded because: results were not divided into TTH or migraine [ 31 , 32 , 34 ], text did not include the required data [ 68 ], it was an experimental-induced pain model [ 36 ], results were not separated by gender [ 69 , 70 ], PPT was not assessed with algometer or dynamometer [ 43 ], or due to the absence of IHS criteria [ 71 ]. Finally, 18 studies satisfied all inclusion criteria and were included in the review of migraine ( Figure 2 ) [ 7 , 12 , 13 , 14 , 15 , 52 , 55 , 60 , 63 , 66 , 72 , 73 , 74 , 75 , 76 , 77 , 78 , 79 ].…”