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[Editorial] Paolo Macchiarini is not guilty of scientific misconduct

Last week, allegations of research misconduct against Paolo Macchiarini, a professor at the Karolinska Institute in Stockholm, Sweden, were finally dismissed. The university issued its final ruling, concluding that there was “nothing to support suspicions of scientific misconduct”. Macchiarini’s work on the transplantation of tissue-engineered tracheas was published in The Lancet in 2011. This article, and several further research and review papers, were the targets of criticism by some of Macchiarini’s former colleagues.