1405
The most frequent causes of the meningitis was the external ventricular drainage ( 14 . 8 % ) , post - neurosurgical ( 0 . 8 % ) and head injury ( 0 . 0007 % ) .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 None