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Disease-Specific Survival of All Patients Diagnosed with Head and Neck Cancer By High (Quintiles 4 – 5) and Low (Quintiles 1 – 3) Neighborhood Socioeconomic Status in California between 1988–2007. (a) Nasopharynx; (b) Oropharynx; (c) Oral cavity; (d) Larynx/Hypopharynx