29416
Evaluation of the positive effects on insulin - resistance and beta - cell measurements of vildagliptin in addition to metformin in type 2 diabetic patients .
 vildagliptin, metformin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 vildagliptin, metformin