Retraction Note to: Soft Computing (2021) 25:12249–12260

The Editor-in-Chief and the Publisher have retracted this article. This article was submitted to be part of a guest-edited issue. An investigation concluded that the editorial process of this guest-edited issue was compromised by a third party and that the peer review process has been manipulated. Based on the investigation's findings, the Editor-in-Chief therefore no longer has confidence in the results and conclusions of this article. None of the authors has responded to correspondence from the Publisher about this retraction.