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Expression of Concern

The editors and the publisher express a note of concern regarding the article “Efficacy of non-invasive auricular acupressure for treating constipation in leukemia patients undergoing chemotherapy: a systematic review” by Chen et al. [1]. It has come to our attention that a very similar paper was previously published in the journal Complementary Therapies in Clinical Practice by another set of authors: “Auricular acupressure is an alternative in treating constipation in leukemia patients undergoing chemotherapy: a systematic review and meta-analysis” by Jing et al. [2]. There is a major overlap in text, method, results and figures. In addition, there is a Prospero record dated May 2017 [3] with a related protocol published in the European Journal of Integrative Medicine [4] which are not cited. In line with the COPE guidelines for redundant (duplicate) publication, we are currently investigating the matter. The authors have been contacted as well as the editors of Complementary Therapies in Clinical Practice. As soon as we receive further information, we will inform the readers accordingly. Harald Walach, Editor-in-Chief