The Editor-in-Chief is issuing an editorial Expression of Concern to alert readers that the Committee of Research Integrity of Pusan University has found that Minso Lim, the fifth author listed on this article1, did not participate in the study described. Yung Hyun Choi has stated that Minso Lim should be included in the authorship. None of the other authors has responded to emails from the Editor or the Publisher.