[1] Univ Maryland, Sch Med, Baltimore, MD USA
[2] Univ Maryland, Sch Med, Dept Epidemiol & Publ Hlth, Baltimore, MD USA
[3] Univ Maryland, Sch Med, Dept Otorhinolaryngol Head & Neck Surg, Baltimore, MD USA
[4] Univ Maryland, Maryland Proton Treatment Ctr, Sch Med, Dept Radiat Oncol, Baltimore, MD USA
[5] Univ Maryland, Sch Med, Marlene & Stewart Greenebaum Comprehens Canc Ctr, Baltimore, MD USA
[6] Univ Maryland, Sch Med, Dept Pathol, Baltimore, MD USA
[7] Univ Maryland, Sch Med, Dept Diagnost Radiol & Nucl Med, Baltimore, MD USA
[8] Univ Maryland, Dept Otorhinolaryngol Head & Neck Surg, 16S Eutaw St Suite 500, Baltimore, MD 21201 USA