Invited reviewers are expected to consider the competing interests to accept the reviewing process of the manuscript.  Reviewers should have no financial conflicts of interest which means that they may profit or be negatively impacted financially by the submitted research. They also should have no personal relationship or competition with the authors, also, they have not recently worked at the same institution or organization as the authors and have no current collaboration with the authors. They have not published or held grants with the authors during the last 5 years.