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To avoid possible career damage, Krieger suggests scientists build a portfolio of papers that includes ones written with different co-authors, which can help make a researcher "less sensitive to the discrediting of any one paper or researcher." But even if a co-author is hit with retractions, Biersack says, "it does not mean the end of your career." Related story Volunteer watchdogs pushed a small country up the rankings By Ivan Oransky, Retraction Watch Drumroll, please: The countries that top our rankings of most retractions by nation are Iran and Romania

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