(https://publicationethics.org/files/u7140/Peer%20review%20guidelines.pdf)
Peer reviewers should:
• only agree to review manuscripts for which they have the subject expertise required to conduct a proper assessment and which they can assess on time.
• respect the confidentiality of peer review and not reveal any details of a manuscript or its review, during or after the peer-review process, beyond those that are released by the journal
• not use information obtained during the peer-review process for their own or any other person’s or organization’s advantage or to disadvantage or discredit others
• declare all potential conflicting interests, seeking advice from the journal if they are unsure whether something constitutes a relevant interest
• not allow their reviews to be influenced by the origins of a manuscript, by the nationality, religious or political beliefs, gender or other characteristics of the authors, or by commercial considerations
• be objective and constructive in their reviews, refraining from being hostile or inflammatory and from making libelous or derogatory personal comments
• acknowledge that peer review is essentially a reciprocal endeavor and undertake to carry out their fair share of reviewing and on time
• provide journals with personal and professional information that is accurate and a true representation of their expertise
• recognize that impersonation of another individual during the review process is considered serious misconduct