Authors should abide by all principles of authorship and declaration of conflicts of interest as stated by the ICMJE.
The ICMJE recommends that authorship be based on the following 4 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.
Those who do not meet all the four criteria can be acknowledged at the end of the article
SAJEM follows the Recommendations for the Conduct, Reporting, Editing, and Publication of Scholarly work in Medical Journals by the ICMJE which can be found here http://www.icmje.org/recommendations/