Reviewers are asked to help improving the quality of manuscript through an objective review proses within a period of time, and contribute to the decision taken by the editorial board. Several responsibilities of peer-reviewers are (1) safeguard the relevance of the work to the journal; (2) advising about important earlier work that may need to be taken into account, (3) checking methods, statistics, sometimes correct English and verify whether the conclusions are supported by the research. Reviewers should be a neutral party with no conflict of interest and with respect to the research, the authors, and/or the research funders. All information among editor, author, and peer-reviews should be maintained confidentially