2835
Fifty - six NS participants , aged 5 to 21 years , were enrolled a median of 4 . 3 ( 0 . 5 to 8 . 1 ) years after diagnosis .
 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