1910
To determine the effects on the pulmonary barrier of several surface active agents , a series of metered dose inhalers ( MDIs ) was prepared and used to dose aerosolized surfactant to the airways of isolated perfused rat lungs .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities:  
Answer:
 None