The full text of HPR is archived in the National Library of Korea (http://www.nl.go.kr). According to the deposit policy (self-archiving policy) of Sherpa/Romeo (http://www.sherpa.ac.uk), authors are not permitted to archive preprints (i.e., pre-refereeing), but they are allowed to archive postprints (i.e., final drafts post-refereeing). Authors can archive the publisher's version/PDF in personal or institutional repositories immediately upon publication without any embargo. By archiving its content in the National Library of Korea, HPR ensures electronic backup and the preservation of access to the journal content in the event the journal is no longer published.