At submission all authors must disclose any financial and personal relationships with other people or organizations that could inappropriately influence (bias) their work. There is a potential conflict of interest when anyone involved in the publication process has a financial or other beneficial interest in the products or concepts mentioned in a submitted manuscript or in competing products that might bias his or her judgment.
Examples of potential conflicts of interest include employment, consultancies, stock ownership, honoraria, paid expert testimony, patent applications/registrations, and grants or other funding. As part of the online submission process, corresponding authors are required to confirm whether they or their co-authors have any conflicts of interest to declare, and to provide details of these.
If there are no conflicts of interest then please state this: 'Conflicts of interest: none'.