1098
The rates of events in users of aspirin were similar for all 3 treatment groups and across valdecoxib doses .
 Chemical: aspirin; Chemical: valdecoxib
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: valdecoxib