This journal provides immediate open access to its content on the principle that making research freely available to the public supports a greater global exchange of knowledge.

JPPG is a peer reviewed journal with open access. The article processing or delivery of the manuscript submitted to the manager or editor through an online system or by using the OJS Open Access publishing model.

In this publishing model, papers are peer-reviewed in the normal way under editorial control. The paper appears electronically and freely available from our website. Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under an Attribution 4.0 International (CC BY 4.0) that allows others to share — copy and redistribute the material in any medium or format and adapt — remix, transform, and build upon the material for any purpose, even commercially with an acknowledgment of the work's authorship and initial publication of article JPPG.