We ask authors to describe in covering letter what each author contributed, and these contributions to the work may be published at the editor's discretion.

Each author should have participated sufficiently in the work to take public responsibility for the content. Authorship credit should be based only on substantial contributions to (a) conception and design, or collection, analysis and interpretation of data; (b) drafting the article or revising it critically for important intellectual content; and (c) final approval of the version to be published. 

Individuals who do not meet the above criteria may be listed in the acknowledgments section of the manuscript.

 

Example: 

1- Study concept and design: S.M. Tayebi; A.A. Mahmoudi

2- Acquisition of data: S.M. Tayebi; A. Saeidi

3- Analysis and interpretation of data: A. Saeidi; L. Gharahcholo

4- Drafting of the manuscript: S.M. Tayebi; A.A. Mahmoudi

5- Critical revision of the manuscript for important intellectual content: S.M. Tayebi

6- Statistical analysis: A. Saeidi; L. Gharahcholo

7- Administrative, technical, and material support: L. Gharahcholo, L. Radmehr

8- Study supervision: S.M. Tayebi