Cancer Help UK, "Laryngeal Cancer Symptoms," http://www.cancerhelp.org.uk/type/larynx-cancer/about/laryngeal-cancer-symptoms (accessed March 15, 2010)

Cancer Help UK, "Nasopharyngeal Cancer Symptoms," http://www.cancerhelp.org.uk/type/nasopharyngeal-cancer/about/nasopharyngeal-cancer-symptoms (accessed March 15, 2010)

Cancer Help UK, "Symptoms of Mouth Cancer," http://www.cancerhelp.org.uk/type/mouth-cancer/about/symptoms-of-mouth-cancer (accessed March 15, 2010)

Cancer Treatment Centers of America, "Throat Cancer Symptoms," http://www.cancercenter.com/throat-cancer/throat-cancer-symptoms.cfm (accessed March 15, 2010)

Cleveland Clinic, "Hypopharyngeal Cancer," http://my.clevelandclinic.org/disorders/Hypopharyngeal_Cancer/hic_Hypopharyngeal_Cancer.aspx (accessed March 15, 2010)

National Cancer Institute, "Human Papillomavirus (HPV) Vaccines," http://www.cancer.gov/cancertopics/factsheet/Prevention/HPV-vaccine (accessed March 16, 2010)

University of Michigan Health System, "Nasopharyngeal Cancer: Treatment," http://health.med.umich.edu/healthcontent.cfm?xyzpdqabc=0&id=6&action=detail&AEProductID=HW%5FKnowledgebase&AEArticleID=ncicdr0000062918&AEArticleType=HealthConditions (accessed March 15, 2010)

University of Texas MD Anderson Cancer Center, "Throat Cancer and Laryngeal Cancer," http://www.mdanderson.org/patient-and-cancer-information/cancer-information/cancer-types/laryngeal-cancer/index.html (accessed March 16, 2010)