1. Department of Surgery; Division of Otolaryngology-Head and Neck Surgery; Howard University College of Medicine; Washington DC U.S.A.
2. Department of Surgery, Clive O. Callender Howard-Harvard Multidisciplinary Outcomes Research Center and the Division of Otolaryngology-Head and Neck Surgery; Howard University Hospital; Washington DC U.S.A.
3. Howard University College of Medicine; Washington DC U.S.A.
4. Department of Surgery; Howard University College of Medicine; Washington DC U.S.A.
5. Department of Otolaryngology-Head and Neck Surgery; Medstar Georgetown University Hospital; Washington DC U.S.A.