1951
METHODS : This study comprised 24 cognitively intact , health elderly adults ( 12 APOE epsilon4 carriers ) at an outpatient geriatric psychiatry research clinic .
 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