“…Five were conducted on a group larger than one thousand persons [19,20,30,37,47]. In eighteen studies, the sample size ranged between one hundred and one thousand participants [4,16,18,24,25,28,29,31,32,[34][35][36]38,40,[42][43][44][45][46], while five of them were conducted on a sample composed of less than one hundred individuals [22,33,39,41,48]. All the results addressed further in this paper, in the results section, are statistically significant unless otherwise stated.…”