Abstract
The above article, published online on January 7th, 2019 in Wiley Online Library (wileyonlinelibrary.com) has been retracted by agreement between the journal's Editor-in-Chief, Hiroaki Kajiyama, Japan Society of Obstetrics and Gynecology, and John Wiley & Sons, Australia, Ltd. The retraction has been agreed on following concerns about the validity of the presented data raised by a third party. As part of the investigation, an independent statistical expert concluded that there are inconsistencies in the data that could only be verified by examining the underlying clinical trial data. The authors have not responded to repeated requests for the original data and have not provided any explanation into the overlap between this study and one published in 2018 in a different journal. Furthermore, while the institute where the research was conducted confirmed that this clinical study was approved by an institutional ethics committee, documentation of the approval is not available. The authors have not responded when asked to agree to this retraction.
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