3759
In four patients hearing impairment on the side of the block was demonstrated after operation , in three measurements on the day of surgery and in one on the following day .
 Disease: hearing 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:
 Disease: hearing impairment