1909
ORR was 4 . 7 % ( 7 . 1 % stratum 1 ; 2 . 3 % stratum 2 ) .
 None
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:
 None