Creative Commons License
All blog posts on our network (but not comments of readers to such posts) are licensed under a Creative Commons Attribution 4.0 International License.

Under this license you are free to:

Share — copy and redistribute the material in any medium or format
Adapt — remix, transform, and build upon the material for any purpose, even commercially.

The licensor cannot revoke these freedoms as long as you follow the license terms.

Under the following terms:

Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use of the material.
No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.


You do not have to comply with the license for elements of the material in the public domain or where your use is permitted by an applicable exception or limitation.

No warranties are given. The license may not give you all of the permissions necessary for your intended use. For example, other rights such as publicity, privacy, or moral rights may limit how you use the material.

Please note: For the terms set in italics in the summary above further details are provided on the Creative Commons web page from which the summary is taken.

Giving credit where credit’s due

We would ask that you credit the author and link to the original post location for material that you use. For example: This post is by Joe Bloggs, and originally appeared on the BioMed Central blog network.

We would also appreciate it if you can let us and/or the author know that you plan to republish the post. You can contact us on


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