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MATERIALS AND METHODS : A systematic literature search was conducted in 6 databases until June 2012 to identify randomized controlled trials ( RCTs ) of XXMD for acute ischemic stroke compared with western conventional medicine ( WCM ) .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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