“…Single trigger site surgery was performed in 12 studies 3,9 -11,15,22,24,27,30-32,37 of which 5 studies 9 -11,15,31 addressed only the frontal trigger site, 4 studies 11,27,30,32 addressed only the temporal site, 2 studies 22,24 addressed the occipital trigger site, and 1 study 37 looked at the nasal trigger site. Multiple trigger site surgery alone was reported in five studies 8,13,34,36,40 and a combination of single and multiple trigger site surgery was discussed in twenty studies 12,14,[16][17][18][19][20][21]23,25,26,28,29,33,35,38,39,[41][42][43][44] . The percentage of females included in the studies ranged from 70% to 100% and the mean age of participants ranged from 16 to 51 years' old.…”