1. Division of Pediatric Otolaryngology–Head and Neck Surgery Cincinnati Children's Hospital Medical Center Cincinnati Ohio U.S.A.
2. Division of Pediatric Otolaryngology, Department of Otolaryngology National Taiwan University College of Medicine and National Taiwan University Hospital and Children's Hospital Taipei Taiwan
3. Department of Otolaryngology Hospital de Clinicas Porto Alegre Brazil
4. Department of Otolaryngology–Head and Neck Surgery University of Cincinnati, College of Medicine Cincinnati Ohio U.S.A.
5. Department of Pediatric Surgery Clinica Las Condes and Hospital de Niños Calvo McKenna and University of Santiago Santiago Chile
6. Department of Pediatric Surgery (Servicio Cirugia Pediatrica) Hospital Universitario La Fe Valencia Spain
7. Department of Pediatric Surgery Hospital Pereira Rossell Montevideo Uruguay