Reviewers should critically evaluate manuscripts based on scientific values of the work, strong evidence for the conclusion that are drawn, novelty, and importance to the specific field. Reviewer selection is critical to the review process, and our choices are based on many factors, including expertise, reputation, specific recommendations, and our previous experience with the reviewer. We avoid using reviewers who are chronically late, unprofessional, too harsh or too lenient. Reviewers are invited by the editors, and only on acceptance of the invitation will a reviewer have access to the full paper.