A paper was submitted to a journal with authors A, B, C, D and E. The paper was peer reviewed. Before acceptance, the corresponding author asked for a new author, author F, to be added, and an existing author, author C, to be removed.
The editorial office asked all of the authors (authors A, B, C, D, E and F) to complete a change of authorship request form and for the corresponding authors to justify the reason for change of authorship.