The corresponding author requests to add an additional author before publication

• Clarify the reason for the change of authorship
• Check that all authors agree to add the additional author

If all authors agree, then:

• Obtain a declaration of authorship from the new author (if used)
• Correct contributor details (the role of each contributor or author), if published
• Proceed with review and publication

If the authors do not agree, then:

Suspend the review or publication of the article until authorship has been agreed upon by all authors, through institutional management if necessary.

Note: Important changes to respond to reviewer comments, e.g., adding new data, may justify the inclusion of a new author