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On September 24, 2017 the Dutch newspaper de Volkskrant reported on an investigation into self-plagiarism (zelfplagiaat) that was conducted by a Nijmengen research group. The sociologist of science and his PhD student analysed 922 publications by Dutch researchers from recent years. In economics, 14 % of the papers contained text from previous publications of the author(s), in psychology the figure was 5 %. They even found a duplicate article republished with just one small change, and two highly similar articles by the same author in the same issue of a journal. They also found that authors who publish more papers are more likely to reuse text.

The Swedish organization in charge of reviewing research has judged that scandal-hit surgeon was guilty of scientific misconduct for misleadingly describing synthetic trachea operations as successful in a series of research articles. In 2014, four doctors at Stockholm's Karolinska University Hospital reported him to the then president of the Karolinska Institute (KI) for allegedly distorting the facts about his operations with artificial tracheas when presenting them in scientific journals. The articles were subsequently reviewed in 2015 by Uppsala University surgical sciences professor, who concluded that Macchiarini was guilty of research misconduct, but KI's overall assessment was to clear him and the co-authors.