“…Overall, 196 students from 5 to 17 years old participated in the 25 studies included in this review. Regarding the number of participants: two of the studies were individual case studies [ 29 , 37 ]; most of them (a total of 16 articles) were carried out with two to five participants [ 21 , 24 , 25 , 26 , 27 , 28 , 30 , 31 , 33 , 34 , 35 , 36 , 39 , 42 , 43 , 45 ]; in two articles, there were from 10 to 19 participants [ 32 , 40 ]; and, finally, in five studies, there were 20 or more participants [ 22 , 23 , 38 , 41 , 44 ].…”