6152
To gain further insight into the pathogenesis of the adult respiratory distress syndrome ( ARDS ) , the authors studied possible relationships among the activation status of circulating polymorphonuclear neutrophils ( PMN ) , cytokine levels , and the severity of lung injury in 31 patients : 15 with ARDS , 9 with severe pneumonia uncomplicated by ARDS , and 7 mechanically ventilated patients with neither ARDS nor pneumonia .
 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