Full text of HPR has been archived in the National Library of Korea (http://www.nl.go.kr).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 cannot archive pre-print (i.e., pre-refereeing), but they can archive post-print (i.e., final draft post-refereeing). Authors can archive the publisher's version/PDF in personal or institutional repositories immediately upon publication without any embargo. HPR provides the electronic backup and preservation of access to the journal content in the event the journal is no longer published by archiving in the National Library of Korea.