Please also read our Copyright and License and Archiving Policy. The pre-print, post-print and publisher's version/PDF can be archived under the following conditions. Authors can save documents on:

1. Personal website
2. Institutional repository.
3. Social Collaboration Networks (SCNs) that have signed the Voluntary Sharing Principles.
4. Individuals requesting personal use for teaching and training within the author's institution, and as part of an author's grant application as long as it is used for educational and social purposes.
5. Authors can post versions of articles that have been submitted to the journal (pre-printed) to the above resources, at any time.