The ethical policy of JSEA is based on the Committee on Publication Ethics (COPE) guidelines and complies with the International Committee of JSEA Editorial Board codes of conduct. Readers, authors, reviewers, and editors should follow these ethical policies when working with JSEA. The ethical policy of JSEA is liable to determine which of the typical research papers or articles submitted to the journal should be published in the concerned issue. For information on this matter in publishing and ethical guidelines please visit http://publicationethics.org.