1. Milton J. Dance, Jr. Head and Neck Center; Baltimore Maryland U.S.A.
2. Department of Biostatistics; Johns Hopkins Bloomberg School of Public Health; Baltimore Maryland U.S.A.
3. Division of Biostatistics and Bioinformatics; Sydney Kimmel Comprehensive Cancer Center, Johns Hopkins School of Medicine; Baltimore Maryland U.S.A.
4. Johns Hopkins Head and Neck Surgery; Baltimore Maryland U.S.A.
5. Department of Otolaryngology; Johns Hopkins Medical Institutions; Baltimore Maryland U.S.A.