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Citation of papers published by Circulation Research in 1992 and 1993. Abscissa: years 1 to 10 are 1992 to 2001 for the 1992 contents and 1993 to 2002 for the 1993 contents. The impact factor of 1994 for Circulation Research is the weighed average of year 2 for the 1993 contents and year 3 of the 1992 contents. Ordinate: citation per paper during the ten years since publication.
