1247
Comparison of developmental toxicity of selective and non - selective cyclooxygenase - 2 inhibitors in CRL : ( WI ) WUBR Wistar rats - - DFU and piroxicam study .
 toxicity, DFU, piroxicam
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 toxicity, DFU, piroxicam