1. Division of Pediatric Otolaryngology-Head and Neck Surgery; Cincinnati Children's Hospital Medical Center; Cincinnati Ohio U.S.A.
2. Department of Otolaryngology-Head and Neck Surgery; University of Cincinnati College of Medicine; Cincinnati Ohio U.S.A.
3. Department of Otorhinolaryngology-Head and Neck Surgery; Montefiore Medical Center; Bronx New York U.S.A.
4. Division of Biostatistics and Epidemiology; Cincinnati Children's Hospital Medical Center; Cincinnati Ohio U.S.A.
5. The Heart Institute; Cincinnati Children's Hospital Medical Center; Cincinnati Ohio U.S.A.
6. Department of Surgery; University of Cincinnati College of Medicine; Cincinnati Ohio U.S.A.
7. Division of Cardiothoracic Surgery; Washington University; St. Louis Missouri U.S.A.