The editors or author may decide to retract an article following publication in PPP. This best practice is adopted for article retraction by PPP.

A retraction can be made under the advice of members of the scholarly community, where the editors:

• have evidence that the findings are unreliable, either as a result of honest mistake or misconduct;
• discover the findings have been published elsewhere, and this has not been properly referenced or justified;
• have evidence of plagiarism;
• discover undeclared competing interests.

The retraction process:

• A retraction note titled “Retraction: [article title]” signed by the authors and/or the editor is published in a subsequent issue of the journal and listed in the contents list.
• In the electronic version, a link is made to the original article.
• The online article is preceded by a screen containing the retraction note. It is to this screen that the link resolves; the reader can then proceed to the article itself.
• The original article is retained unchanged save for a watermark on the .pdf
  indicating on each page that it is “retracted.”
• The HTML version of the document is removed.