1. Department of Pathology, Seattle Children's Hospital and University of Washington, Seattle, Washington
2. Department of Pathology and Laboratory Medicine, Nationwide Children's Hospital, Columbus, Ohio
3. Department of Pathology, The Ohio State University Wexner Medical Center, Columbus, Ohio
4. Department of Gastroenterology, Seattle Children's Hospital and University of Washington, Seattle, Washington
5. Department of Pediatric Surgery, Seattle Children's Hospital and University of Washington, Seattle, Washington
6. Center for Colorectal and Pelvic Reconstruction, Nationwide Children's Hospital, Columbus, Ohio
7. Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee