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If you have any questions about paper submissions, processing and publishing, please send your inquiries to the editorial assistant Joanna Cheng via etsn@scirp.org.

If you need immediate contait with the editorial assistant, please contact us by using the Livechat message box at the right bottom corner of the page.

If you have complaints or suggestions for the journal, please contact customer@scirp.org.

Formal complaints are handled based on SCIRP's Complaints Procedure.