1. Department of Otolaryngology-Head & Neck Surgery; Oregon Health & Science University; Portland Oregon U.S.A
2. Department of Otolaryngology-Head & Neck Surgery; University of Southern California; Los Angeles, Los Angeles California U.S.A
3. Department of Otolaryngology-Head & Neck Surgery; Dwight D. Eisenhower Army Medical Center; Fort Gordon Georgia U.S.A