1. Department of Otolaryngology-Head & Neck Surgery at Boston University/Boston Medical Center; Boston Massachusetts U.S.A
2. Division of Otolaryngology; Nemours/Alfred I. duPont Hospital for Children; Wilmington Delaware U.S.A
3. Department of Otolaryngology-Head and Neck Surgery; Thomas Jefferson University; Philadelphia Pennsylvania U.S.A
4. Private practice; Reston Virginia U.S.A
5. Department of Pediatrics; Thomas Jefferson University; Philadelphia Pennsylvania U.S.A