The International Committee of Medical Journalists Editors defines some criteria for writing a paper, and everyone with all those criteria can be considered as an author.
These criteria include
- significant contribution in designing, collecting, or analyzing and interpreting the data
- writing the draft of article or modifying it in a significant and scientific way.
- Confirming the final edition of the paper
It is an agreement in which any questions about the integrity and precision of the project were examined, and each writer is aware of the others’ roles in project.
Note: There is no special rule regarding the first author; however, it is usually the first person with the highest level of contribution (collecting the data and writing the first copy of the article, etc.) in the project (e.g., a student), and the supervisor will be usually placed as the last person in the list.
In addition, the supervisor is introduced as the corresponding author because it is assumed that he/she has the highest knowledge on the subject and is able to answer the questions raised by experts and referees. Generally, in an English-language article, the list of authors from left-to-right is based on their contributions in project and their academic degrees.