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.