Authorship: According to the ICMJE recommendations, those who meet the following criteria should be identified as authors:

1. Substantial contributions to the conception or design of the work; or the acquisition, analysis, or interpretation of data for the work; AND
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3. Final approval of the version to be published; AND
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Permission and copyright: Where relevant, it is the responsibility of the authors to obtain permission from copyright holders, and to ensure that the use of images, data, and illustrations in the chapters do not violate copyright laws. It is mandatory that the authors include the following statement is their chapters:

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Research and data integrity: The authors are responsible for ensuring the research was conducted in an ethical manner, data were collected and analyzed by employing appropriate scientific methods and interpreted accurately. 

Acknowledgements: Where relevant, the authors should acknowledge their colleagues and sources of funding that made their research possible.

Conflict of interest: It is mandatory that the authors declare any conflicts of interest that are pertinent to their chapter(s). More information on conflict of interest is given here. If there is no conflict of interest, the authors should include the following statement:

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