The corresponding author of each accepted paper is required to pay the Article Processing Charge (APC) before the accepted paper is published online. Published papers are available electronically and can be freely accessed from our website. As a non-profit organization, we request a publication fee to support the wide dissemination of research results, production, and maintenance of archives. The corresponding author is required to pay the publication fee as outlined below.

• Please make the payment within one week of receiving the invoice.