1352
RESULTS : Person - years of exposure among non - users of aspirin were : 75 , 761 to acetaminophen , 42 , 671 to rofecoxib 65 , 860 to celecoxib , and 37 , 495 to NS - NSAIDs .
 Chemical: aspirin; Chemical: acetaminophen; Chemical: rofecoxib; Chemical: celecoxib
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: acetaminophen; Chemical: rofecoxib; Chemical: celecoxib