228544
According to the Journal Citation Reports , the journal has a 2010 impact factor of 14.292 , ranking it 2nd out of 114 journals in the category " Cardiac & Cardiovascular Systems " .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None