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The purpose of the present study was to examine the safety and efficacy of ketamine for sedation in the treatment of children ' s fractures in the emergency department .
 Chemical: ketamine; Disease: fractures
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
 Entities: ketamine, fractures 
Answer:
 Chemical: ketamine; Disease: fractures