We require all authors to understand and abide by COPE(https://publicationethics.org/) publishing ethics, which provides ethical guidelines and codes of conduct for publishers, journal editors and reviewers. It mainly includes the following ethics:

• Authors: Each author must make a significant contribution to the work, and all authors and participants are responsible for the content of the work, whether in data collection, program design, research, or writing.
• Plagiarism: Improper reference (including reference the data and charts, etc. without indicating the source), self plagiarism, falsifying data, multiple publishing. Once found the above behavior or complaints received, we will contact the author for the raw data, if the author cannot provide sufficient evidences/explanation, the paper will be rejected and the published papers will be withdraw.
• Conflict of interest: Please indicate about any conflict of interest in published papers, including the research funding, direct or indirect financial support, or any other assistance. Please make sure there is no conflict of interest.
• Originality: Authors must certify that the submitted papers were not previously published nor currently being considered for publication elsewhere.