3758
Three audiometric threshold measurements ( 0 . 25 - 18 kHz ) were made : the first before IBPB , the second 2 - 6 h after surgery and the third on the first day after operation .
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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:
 None