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Limiting depth of sedation during spinal anesthesia is a simple , safe , and cost - effective intervention for preventing postoperative delirium in elderly patients that could be widely and readily adopted .
 Disease: postoperative delirium
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: postoperative delirium