“…The studies employed various cognitive function measures. The tests used to examine the executive domain of cognitive function were the Trail Making Test, 29 , 31 , 34 – 41 , 48 , 50 , 51 , 54 , 55 , 58 Digit Symbol Substitution Test, 31 , 35 – 41 , 50 , 54 , 55 Digit Span Test, 31 , 36 , 39 , 42 , 43 , 49 , 51 – 53 , 55 and Controlled Oral Word Association Test. 29 , 31 , 35 , 37 , 38 , 43 , 45 , 51 , 54 Verbal memory was most commonly assessed using the California Verbal Learning Test.…”