1977
The majority of survey participants ( 64 % ) expressed willingness to participate in biobanking and over 90 % of them preferred an opt - in consent form whether general ( 75 . 2 % ) or specific for disease or treatment ( 16 . 9 % ) .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None