20660
To the patients in the first group ( 30 patients ) , percussion - vibration was performed in the 45 degrees supine position , while slightly laterally lying and endotracheal aspiration was performed in the supine position .
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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