1. Department of Surgery, University of Washington, Seattle, Washington.
2. Department of Health Services, University of Washington, Seattle, Washington.
3. Department of Pediatrics, Division of Pulmonary and Sleep Medicine, Seattle Children's Hospital, Seattle.
4. Department of Pediatrics, Division of Infectious Disease, Seattle Children's Hospital, Seattle.
5. Department of Radiology, Seattle Children's Hospital.
6. Department of Thoracic and General Surgery, Seattle Children's Hospital.