1353
Among users of aspirin , they were : 14 , 671 to rofecoxib , 22 , 875 to celecoxib , 9 , 832 to NS - NSAIDs and 38 , 048 to acetaminophen .
 Chemical: aspirin; Chemical: rofecoxib; Chemical: celecoxib; Chemical: acetaminophen
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: aspirin; Chemical: rofecoxib; Chemical: celecoxib; Chemical: acetaminophen