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Twenty - four children aged 1 - 18 years with MPS I , II or VI were prospectively evaluated with echocardiogram and electrocardiogram from the start of enzyme - replacement therapy up to 6 years of treatment .
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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:
 None