7697
85 % of research papers report at least one biological effect ; and 18 out of 21 review papers ( published between 1970 and 2012 ) express a positive view .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None