“…The studies were intercontinental, mainly from Europe [ 21 , 45 – 50 ], followed by Asia [ 20 , 22 , 51 – 55 ] and North America [ 14 , 17 – 19 , 56 , 57 ]. Specifically, six studies were from the USA [ 14 , 17 – 19 , 56 , 57 ]; four studies were from Taiwan, China [ 51 – 54 ]; three, Portugal [ 21 , 45 , 46 ]; two, Brazil [ 58 , 59 ]; two, South Korea [ 20 , 55 ]; one, Belgium [ 47 ]; Spain [ 50 ]; the Netherlands [ 48 ]; Iran [ 22 ]; and the UK [ 49 ]. The participants in these studies were both normal [ 14 , 19 – 21 , 45 , 46 ] and exceptional [ 17 , 18 , 22 , 47 – 59 ] children.…”