11841
Inclusion criteria were as follows : ( a ) malignant or benign nodules confirmed on histologic examination of surgical specimens after US - guided FNA and ( b ) nodules not histologically confirmed that were subjected to FNA at least twice and follow - up US examinations for 2 years .
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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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