This article has been retracted: please see Elsevier Policy on Article Withdrawal (https://www.elsevier.com/about/our-business/policies/article-withdrawal).

The Editor’s Note to which this retraction notice refers was originally published with a number of errors introduced by the publisher.

The Note was erroneously retracted in order to make the necessary corrections. The Editor’s Note has since been corrected and the retraction is, therefore, unnecessary and is withdrawn.

Apologies are offered by the publisher to the Editor and to the readers of the journal for any confusion.