### Ethical Principles and Publication Policy

Authors must submit an ethics committee approval document for articles published in IJCER as of July 1, 2021. The ethics document should including the name of the relevant institution, the date of the document, and the decision-number information of the document. If your study is a paper that does not require an ethics committee document, please indicate this situation. An ethics committee document is not needed for articles produced from theses. Please see the submission guidelines for more information.