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MEASUREMENTS AND MAIN RESULTS : Metoprolol reduced maximum heart rate 31 % , summed stress scores 29 % , and summed difference scores 43 % versus control .
 Chemical: Metoprolol
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:
 Chemical: Metoprolol