19052
The largest portion of HF cases referred to age < 55 ( 42 . 57 % ) with female predominance ( 56 . 81 % ) , whereas age >= 55 ( 32 . 57 % ) showed almost even gender distribution .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None