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Auditory threshold shifts , as measured by the auditory evoked brainstem response , were measured at 2 , 4 , 8 , 12 , 16 , 20 and 24 kHz .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
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