1 Section of Pediatric Otolaryngology, Head & Neck Institute, Cleveland Clinic, 9500 Euclid Avenue A71, Cleveland, OH 44195, USA. Electronic address: annes@ccf.org.
2 Adult and Pediatric Laryngology, Bobby R. Alford Department of Otolaryngology Head and Neck Surgery, Baylor College of Medicine, Texas Children's Hospital, 6701 Fannin, Suite 640, Houston, TX 77030, USA. Electronic address: julinao@bcm.edu.