We advocate for transparency and openness around data, code, and other materials associated with research, and we are a signatory of the Transparency and Openness Promotion (TOP) Guidelines.  We expect authors to maintain accurate records of supporting evidence necessary to allow others to understand, verify, and replicate new findings, and to supply or provide access to this supporting evidence, on reasonable request. Where appropriate and where allowed by their employer, funding body or others who might have an interest, we encourage authors to:

• deposit evidence in a suitable repository or storage location, for sharing and further use by others; and
• describe where the evidence may be found in a Data Availability Statement which authors should include in their publication.

Many of our publications also permit authors to submit and publish supplementary materials that are not essential for inclusion or that cannot be accommodated in the main text, but that would be of benefit to the reader. Unless otherwise stated, it should be assumed that data, code, and other materials or supplementary files will not be peer-reviewed. Where published alongside the main publication, we consider these supplementary files to be part of the Version of Record and subject to the same preservation and transparency principles as outlined in the Integrity of Record section of our Core editorial policies.