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We investigated whether between - subject variation in thyroid hormone levels within the euthyroid range is also associated with heart rate and echocardiographic heart function and structure .
 Chemical: thyroid hormone
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: thyroid hormone 
Answer:
 Chemical: thyroid hormone