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All Authors must disclose any financial and personal relationships with other people or organizations that could inappropriately influence (bias) their work. Examples of potential conflicts of interest include employment, consultancies, stock ownership, honoraria, paid expert testimony, patent applications/registrations, and grants or other funding. If there are no conflicts of interest then please state this: 'Conflicts of interest: none'.

Upon submission Authors will be required to declare funding, competing interests and to indicate whether ethical approval was sought. This information must also be inserted into the manuscript under the 'Acknowledgements' section with the headings below. If there are no declarations to make, the following statements should be inserted into the manuscript:

Funding: None; Competing interests: None declared; Ethical approval: Not required (please add a brief explanation as to why ethical approval was not needed for the study).

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