121508
The research asserts that if the insertion of tympanostomy tubes into a child 's ear is delayed , there is " no effect on a child 's performance on language tests and speech tests . "
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None