2733
Considering that , we conducted a case - control association study using a clinically well defined group of AD patients ( n = 82 ) and age and sex matched control subjects ( EC ; n = 78 ) in order to test the association with these variations of BCHE gene in a Brazilian population .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None