“…A total of 124 studies were initially identified; after a review of the full text, 87 were excluded, as they included neurodegenerative or genetic disorders ( n = 55), as they were case reports ( n = 15), or as they did not provide details on 6MWT ( n = 17). The remaining 37 articles [ 7 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 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 ], comprising a total of 1292 children, met the inclusion criteria after a review of the full text ( Figure 1 ).…”