1. National Academy of Medicine of Korea. Korea medical research report 2010. 2011. Seoul: National Academy of Medicine of Korea;8–18.
2. National Science Board. Science and engineering indicators 2010. 2010. Arlington: National Science Foundation;5.5–5.45.
4. Korean Association of Medical Journals Editor. KoreaMed [Internet]. c2012. cited 2012 May 30. Seoul: Korean Association of Medical Journals Editor;Available from:
http://www.koreamed.org.
5. US National Library of Medicine. Leasing journal citations (Medline/PubMed including Oldmedline) [Internet]. 2011. cited 2012 May 30. Bethesda: US National Library of Medicine;Available from:
http://www.nlm.nih.gov/databases/journal.html.