447
278 ( 57 . 9 % ) cases were in the group aged 21 - 50 , followed by 102 ( 21 . 3 % ) , 79 ( 16 . 5 % ) and 21 ( 4 . 4 % ) cases in the group aged 51 - 70 , 0 - 20 , and > = 71 , respectively .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 None