1. Perelman School of Medicine; University of Pennsylvania; Philadelphia PA 19104 USA
2. Department of Otolaryngology-Head and Neck Surgery; Johns Hopkins Medical Institutions; Baltimore MD 21205 USA
3. Mid-Michigan Ear, Nose, and Throat, P.C.; East Lansing MI 48823 USA
4. Milton J. Dance Head and Neck Center; Greater Baltimore Medical Center; Towson MD 21204 USA
5. Department of Mathematics and Statistics; The College of New Jersey; Ewing NJ 08628 USA