1. World Health Organization. Comprehensive cervical cancer control: a guide to essential practice. Geneva, Switzerland: WHO Press; 2006.
2. Parkin DM, Bray F. Chapter 2: the burden of HPV-related cancers. Vaccine. 2006;24S3:S3/11–25.
3. National Cancer Institute. Cervical cancer. http://www.cancer.gov/cancertopics/types/cervical/ . Accessed March 29, 2009.
4. Schiffman M, Castle PE. The promise of global cervical-cancer prevention. N Engl J Med. 2005;353:2101–4.
5. American Cancer Society. Cervical cancer: prevention and early detection. http://www.cancer.org/docroot/CRI/content/CRI_2_6x_cervical_cancer_prevention_and_early_detection_8.asp?sitearea=PED . Accessed November 30, 2008.