1. From the Department of Otolaryngology-Head and Neck Surgery (Drs Bitar and Moukarbel), American University of Beirut Medical Center, American University of Beirut School of Medicine, Beirut, Lebanon
2. From the Department of Pediatric Otolaryngology-Head and Neck Surgery (Dr Zalzal), Children's National Medical Center, George Washington University School of Medicine, Washington, DC.