Head and Neck Cancers Qingyi Wei, Hongbing Shen, and Margaret R. Spitz Department of Epidemiology, M. D. Anderson Cancer Center, University of Texas, Houston, Texas, U.S.A.

Erich M. Sturgis Department of Head and Neck Surgery, M. D. Anderson Cancer Center, University of Texas, Houston, Texas, U.S.A.

Peter G. Shields Cancer Genetics and Epidemiology Program, Department of Medicine and Oncology, Lombardi Cancer Center, Georgetown University Medical Center, Washington, D.C., U.S.A.