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Several anecdotal clinical cases of pancreatitis have been reported with sitagliptin and vildagliptin and an increased relative risk reported to the FDA with sitagliptin versus other comparators , but reporting bias cannot be excluded .
 Chemical: sitagliptin; Chemical: vildagliptin; Chemical: sitagliptin
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: sitagliptin; Chemical: vildagliptin; Chemical: sitagliptin