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Using magnetic resonance imaging ( MRI ) and new computational brain - mapping techniques , we determined the pattern of structural brain alterations associated with chronic MA abuse in human subjects and related these deficits to cognitive impairment .
 Chemical: MA; Disease: cognitive impairment
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: MA; Disease: cognitive impairment