This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
The journal retracts the 12 May 2020 article cited above.
Following publication, concerns were raised regarding the clinical trial registration for this study. An investigation was conducted in accordance with Frontiers’ policies, and it was confirmed that, contrary to the statements in the article, the study was not an accurate reflection of the study registered with the clinical trial registry. Lack of appropriate clinical trial registration is a breach of Frontiers’ guidelines and those of the Committee on Publication Ethics. As such, this article is being retracted. The authors received a communication regarding the retraction and had a chance to respond. This communication has been recorded by the publisher.
Frontiers would like to thank Prof. John Loadsman for contacting the journal regarding the published article.