1. Epidemiology of HPV-associated oropharyngeal cancer;Pytynia;Oral Oncol,2014
2. Howlader N, Noone AM, Krapcho M, Garshell J, Neyman N, Altekruse SF, et al., editors. SEER Cancer Statistics Review, 1975-2010, National Cancer Institute. Bethesda, MD, Based on November 2012 SEER data submission, posted to the SEER web site; 2013. http://seer.cancer.gov/csr/1975_2010/.
3. Comorbidity is a prognostic factor in elderly patients with head and neck cancer;Sanabria;Ann Surg Oncol,2007
4. Validation of the composite laryngeal recurrence staging system;Lacy;Cancer,2004
5. Inclusion of comorbidity in a staging system for head and neck cancer;Piccirillo;Oncology,1995