“…The samples used in the various studies vary considerably, both in number, where there is a range from one person to 3216, and in the population on which it is focused. First, in relation to the size of the sample, there are studies that have used a sample between one and 150 people [19,21,27,33,59,61], between 151 and 400 people [11,13,18,[23][24][25]30,31,34,35,60,62,64], between 401 and 1000 people [1,2,4,12,[14][15][16]22,26,29,32,36,37,39,58,63,65], or more than 1000 [7]. Second, with regard to population, studies have focused on volunteers of various classes and types [5,16,20,22,59,60], adolescents or youth [4,7,28,[34]…”