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To give appropriate credit to each author, the individual contributions of authors should be specified in the manuscript.
An 'author' is generally considered to be someone who has made substantive intellectual contributions to a published study. The International Committee of Medical Journal Editors http://www.icmje.org/recommendations/browse/roles-and-responsibilities/defining-the-role-of-authors-and-contributors.html has produced the following guidelines that to qualify as an author one should have:
Acquisition of funding, collection of data, or general supervision of the research group, alone, does not usually justify authorship.
All contributors who do not meet the criteria for authorship should be listed in an ‘Acknowledgements’ section. Examples of those who might be acknowledged include a person who provided purely technical help or writing assistance, or a department chair who provided only general support.