1. Department of Head and Neck Surgery & Communication Sciences Duke University Durham North Carolina U.S.A.
2. Department of Biostatistics and Bioinformatics Duke University Durham North Carolina U.S.A.
3. Surgery Center for Outcomes Research Duke University Durham North Carolina U.S.A.
4. Department of Otolaryngology University of Texas Health at San Antonio San Antonio Texas U.S.A.
5. Department of Surgery Duke University Durham North Carolina U.S.A.