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To the Editor:The joal impact factor (IF) was conceived by Garfield in 1955 to help librarians identify the most influential joals based on the number of citations,and the first ranking of joals by IF was published in 1972.[1] We systematically analyzed the IFs of emergency medicine joals published in Joal Citation Report(R) (JCR) for the past 10 years (2005-2014).