It is useful to build a database of critical reviewers. Over time, you may find that some of them are also very suited to be new members of the editorial or advisory board. It could also be helpful for strategic reasons to ask influential persons to become advisers or board members, for instance the dean of a medical faculty, the president of a professional organization of doctors or pharmacists or the drug inspector of the Ministry of Health. You will want to ensure that they have no conflicts of interest, for example, because of financial ties to the pharmaceutical industry or because they are linked in some way with the government departments that have a tendency to support any national pharmaceutical companies.