[1] Med Univ South Carolina, Dept Publ Hlth Sci, 68 President St,MSC 955, Charleston, SC 29425 USA
[2] Med Univ South Carolina, Hollings Canc Ctr, 68 President St,MSC 955, Charleston, SC 29425 USA
[3] Med Univ South Carolina, Dept Otolaryngol Head & Neck Surg, 87 Jonathan Lucas St MSC 955, Charleston, SC 29425 USA
[4] Med Univ South Carolina, Hollings Canc Ctr, 87 Jonathan Lucas St MSC 955, Charleston, SC 29425 USA
[5] Univ South Carolina, Dept Epidemiol & Biostat, 915 Greene St Room 465, Columbia, SC 29208 USA