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Of 67 patients initially enrolled , 24 remained on thalidomide for 3 months , 8 remained at 6 months , and 3 remained at 9 months .
 Chemical: thalidomide
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: thalidomide