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Finally the most critical point about IF is that it can be manipulated by Editors or Publishers. Here are some examples: Editors may choose to publish more reviews, hoping that they get more citations. Editors may decrease the number of published citable manuscripts, thus decreasing the number in the denominator of the equation to calculate the IF and thus increasing the IF. Furthermore papers with a higher probability to be quoted are published early in the year, because they have more time to generate citations. 3,4 There are some more methods to increase the IF, which I consider unethical. One is that the editor actively promotes some papers from his journal as interesting and citable to his/her peers. Another step is that some editors tend to “help” authors to improve the article and have it published with the Editor ending on the author line in the hope to increase the IF of the journal as well the personal cumulative IF of the Editor. Finally some Editors and/or publishers practice something that is called “coercive citation”. 5,6 At the end of the review process they confront the authors with a list of papers that have been published in “their” journal and require the authors to add them to their reference list as a prerequisite for publication! The newest thing that has appeared is fake impact factor, used by so called predatory publishers. They create an IF with publications that are not listed with ISI. 7 Therefore, dear readers, think twice when you look at an IF! It is obvious that the IF is NOT a number indicating the quality of a paper. It is much better to look at the content to make your judgement! Sincerely yours, J-F Roulet Editor-in-Chief References 1. 2. 3. 4. InCites Journal Citation Reports Garfield E. [The impact factor and its proper application]. Unfallchirurg. 1998;101(6):413-414. [Article in German]. [PubMed] Google Scholar (11) Scopus (57) Agrawal AA. Corruption of journal Impact Factors. Trends Ecol Evol. 2005;20(4):157. doi: 10.1016/j.tree.2005.02.002. [Full text links] [PubMed] Google Scholar (60) Scopus(31) Fassoulaki A, Papilas K, Paraskeva A, Patris K. Impact factor bias and proposed adjustments for its determination. Acta Anaesthesiol Scand. 2002;46(7):902-905. doi:10.1034/j.1399-6576.2002.460723.x. [Full text links] [PubMed] Google Scholar (80) 5. 6. 7. Wilhite AW, Fong EA. Scientific publications. Coercive citation in academic publishing. Science. 2012;335(6068):542-543. doi: 10.1126/science.1212540. [Full text links] [Pub Med] Google Scholar (253) Scopus (135) Smith R. Journal accused of manipulating impact factor. BMJ. 1997;314(7079):461. doi: https://doi.org/10.1136/bmj.314.7079.461d Google Scholar (61) Scopus (121) Jalalian M. The story of fake impact factor companies and how we detected them. Electron Physician. 2015;7(2):1069-1072. doi: 10.14661/2015.1069-1072. [Full text links] [Free PMC Article] [PubMed] Google Scholar (28) DOI:10.25241/stomaeduj.2017.4(4).edit.1 Stomatology Edu Journal 237