“…In 13 studies, the target population was selected from multiple institutions or schools [ 10 , 12 , 13 , 20 , 21 , 26 , 27 , 30 , 33 , 39 , 43 , 44 , 46 ], while in the remaining studies the sample population was either from a single institution or the exact number was not stated. The sample sizes of included studies ranged between 23 and 819 participants [ 10 , 11 , 12 , 13 , 14 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 ]. Overall, 942 participants with Down syndrome, 1070 with autism spectrum disorder, 564 with cerebral palsy, 466 with a visual impairment, 785 with a hearing and/or speech impairment, 656 with intellectual disabilities, 111 with learning disabilities, 30 with epilepsy, 221 that were medically compromised, and 128 with unclassified disabilities we...…”