2430
Sedation depth was titrated using processed electroencephalography with the bispectral index ( BIS ) , and patients were randomized to receive either deep ( BIS , approximately 50 ) or light ( BIS , > or = 80 ) sedation .
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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