- Contribute significantly to at least two of the following aspects:
- study design or conception of the work
- data acquisition, analysis, or interpretation
- drafting the work or revising it critically (in terms of intellectual content, not simply language correction)
- Approve the version submitted to the journal and the final version to be published
- Agree to be accountable for appropriate parts of the work and have confidence in the integrity of the entire work
Individuals who contributed to the work but do not meet all three of the above criteria should be acknowledged.