References
- Health Insurance Review & Assessment Service. Cancer Medications [Internet]. Seoul (KR): Health Insurance Review & Assessment Service. c2011 [cited 2011 Jun 4]. Available from: http://www. hira.or.kr/cms/rd/rdg_infor/drugs/chemicals/pain/index.htm
- National Comprehensive Cancer NetworkClinical Practice Guidelines in Oncology. Adult Cancer Pain. [Internet]. Fort Washington (PA): National Comprehensive Cancer. c2011 [cited 2011 Jun 4]. Available from: http://www.nccn.org/professionals/ physician_gls/pdf/pain.pdf.
- National Cancer Institute at the National Institutes of Health. Pain.Bethesda (MD): National Cancer Institute. c2011 [cited 2011 Jun 4]. Available from: http://www.cancer.gov/cancertopics/pdq/ supportivecare/pain/HealthProfessional.