11839
The purpose of this study was to evaluate the diagnostic yield and accuracy of ultrasound ( US ) - guided fine needle aspiration ( FNA ) of thyroid nodules with macrocalcification and to investigate the association between macrocalcification subtype and malignancy risk .
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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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