What to do if the reviewer suspects that there is an undisclosed conflict of interest (COI) in a received manuscript?

1. The reviewer informs the editor of the CoI not revealed by the order
2. Thank the reviewer and let them know that you plan to investigate
3. Contact the author (s) and express your concern

In the latter there are two alternatives:

1. The author (s) provide the relevant details, then:

• Thank the author but indicate that this is a serious omission
• Amend, if applicable, the conflict of interest declaration
• Proceed with review and publication
• Inform the reviewer of the result

1. The author (s) deny that there is CoI

• Clearly explain the journal's policy and definition of COI , and obtain from each author a signed statement on all relevant COIs

NOTE: To avoid future problems: Always obtain a signed
COI statement from all authors before publication (or an indication on a checklist or form that there are no conflicts)
Check that the journal's policies include a clear definition of COI