期刊介绍：

With an Impact Factor of 14.739, Circulation is ranked 1st for Impact Factor, total cites, 5-Year Impact Factor, Article Influence(TM) score, and Eigenfactor(TM) score within the Cardiac & Cardiovascular Systems and Peripheral Vascular Disease subject categories in the 2011 Journal Citation Reports® (Thomson Reuters, 20112).  Circulation is also ranked 1st for Impact Factor, total cites, 5-year Impact Factor, and Article Influence(TM) score in the Hematology subject category.