Full text of IR has been archived in PubMed Central (PMC)/Europe PMC (https://www.ncbi.nlm.nih.gov/pmc/journals/2608/) and National Library of Korea (http://www.nl.go.kr) from the 1st volume, 2014. Authors can archive publisher's version/PDF. IR provides the electronic backup and preservation of access to the journal content in the event the journal is no longer published by archiving in PubMed Central and National Library of Korea.