An author is an individual who has significantly contributed to the development of a manuscript. International committee of medical journal editors (ICMJE) recommends that authorship be based on the following four criteria:

1) Substantial contributions to the conception or design of the work; or the acquisition, analysis, or interpretation of data for the work; AND
2) Drafting the work or revising it critically for important intellectual content; AND
3) Final approval of the version to be published; AND
4) Agreement to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.
-   Acknowledgement
Individuals who participated in the development of a manuscript but do not qualify as an author should be acknowledged. Organizations that provided support in terms of funding and/or other resources should also be acknowledged.
-   Changes in authorship
Whenever there is a need to make changes in the authorship of a manuscript or a published article, the changes will be implemented according to committee on publication ethics (COPE) specification. Only corresponding authors can make request for a change in authorship. 

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