1. World Health Organization Globocan 2012. Undefined (2012): estimated cancer incidence, all ages: both sexes http://globocan.iarc.fr/old/summary_table_pop-html.asp?selection=224900&%20title=World&sex=0&type=0&window=1&sort=0&submit=%C2%A0Execute%C2%%20A0 2017
2. Cancer statistics, 2016;Siegel;CA Cancer J Clin,2016
3. National Comprehensive Cancer Network NCCN clinical practice guidelines in oncology (NCCN guidelines): head and neck cancers (version 2.2017) https://www.nccn.org/professionals/physician_gls/pdf/head-and-neck.pdf 2017
4. Postoperative concurrent radiotherapy and chemotherapy for high-risk squamous-cell carcinoma of the head and neck;Cooper;N Engl J Med,2004
5. Postoperative irradiation with or without concomitant chemotherapy for locally advanced head and neck cancer;Bernier;N Engl J Med,2004