“…Five studies included only male, 22,23,[25][26][27] one study only female, 21 and four studies both male and female 24,[28][29][30][31][32] participants. Two studies only included 1 participant, 19,22 three studies included 12, 23,25,30 three studies included 16, 21,26,28 two included 20, 27,31 one 56, 29 one 98, 32 and one 136 24 participants. Three studies included participants over 35 years of age, 21,24,32 in one study the age of the single participant was not reported, 19 but comparison with another study by the same authors with the same data utilized 22 led us to believe that the participant was the same.…”