Peer reviews assist the editor in making editorial decisions and may also help authors to improve their manuscript. Any selected referee who feels unqualified to review the research reported in a manuscript or knows that its timely review will be impossible should notify the editor and excuse themselves from the review process.

All manuscripts received for review must be treated as confidential documents. They must not be shown to or discussed with others except those authorized by the editor.

Reviews should be conducted objectively. Personal criticism of the author is inappropriate. Referees should express their views clearly with appropriate supporting arguments.

Reviewers should identify the relevant published work that has not been cited by authors. Any substantial similarity or overlap between the manuscript under consideration and any other published paper should be reported to the editor.

Privileged information or ideas obtained through peer review must be kept confidential and not used for personal advantage. Reviewers should not consider evaluating manuscripts in which they have conflicts of interest resulting from competitive, collaborative, or other relations with any of the authors, companies, or institutions involved in writing a paper.