1. Korean Statistical Information Service [Internet]. http://kosis.kr/statHtml/statHtml.do?orgId=117&tblId=DT_117N_A00121&conn_path=I3 .
2. National vital statistics reports. Statistics Korea [Internet]. Daejeon: Statistics Korea. http://www.index.go.kr/potal/main/EachDtlPageDetail.do?idx_cd=2758 .
3. In house 2015 data. Korea: Intuitive Surgical Inc.
4. National Cancer Center. Cancer Statistics [Internet]. http://ncc.re.kr/english/infor/kccr.jsp .
5. National Cancer Information Center. Prostate Cancer [Internet]. http://www.cancer.go.kr/mbs/cancer/jsp/cancer/cancer.jsp?cancerSeq=4949&menuSeq=4950&viewType=all&id=cancer_020112000000 .