11994
As a reflection of uncertainties in the estimates for individual sources , the 90th percentiles of PCDD / F releases for 1999 ranged up to 4 . 1 g I - TEQ / y .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 None