8682
When data were expressed in a cumulative manner , the response to intravenous adenosine 3 mg , 6 mg , 9 mg and 12 mg in the 24 episodes of PSVT were 5 episodes ( 21 % ) , 16 episodes ( 67 % ) , 20 episodes ( 83 % ) and 20 episodes ( 83 % ) respectively .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 None