On behalf of the Circulation Journal, I am pleased to report the official 2013 impact factor and the Circulation Journal papers (2011-2012) most frequently quoted in 2013, that substantially contributed to the 2012 impact factor of the Journal. 1. The Official 2013 Impact Factor I am pleased to report that Circulation Journal has earned an official 2013 Impact Factor (IF) of 3.685. The official ranking also places Circulation Journal 36th among the 125 journals in the Cardiac & Cardiovascular Systems category in 2013 JCR Science Edition (33th among the 124 journals in 2012). 2. The Most Frequently Quoted CJ Papers (2011-2012) in 2013 The following papers, published in 2011-2012, were among the top 31 most frequently quoted papers in 2013, thereby substantially contributing to the 2013 Impact Factor of the Journal (number in the parenthesis denoted the number of quotation in 2011 -2012).
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