1. Department of Otolaryngology/Head and Neck Surgery MedStar Georgetown University Hospital Washington District of Columbia U.S.A.
2. Department of Otolaryngology/Head and Neck Surgery Georgetown University School of Medicine Washington District of Columbia U.S.A.
3. Department of Biostatistics and Biomedical Informatics MedStar Health Research Institute Hyattsville Maryland U.S.A.
4. Department of Otolaryngology/Head and Neck Surgery MedStar Washington Hospital Center Washington District of Columbia U.S.A.