19 November 2020
Authors information removed from 'About this resource'. (The PDF lists author contributions and acknowledgements.)
19 November 2020
Minor edits of About this resource
19 November 2020
Updated 'About this resource' info.
19 November 2020
Link in body of page to newer V2 PDF updated.
19 November 2020
Design edits and metadata added to PDF.
17 May 2020
Text replaced with summary text from 2019 guidelines.
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11 December 2019
2019 updated Retraction Guidelines replace version 1 as pdf.