1. Department of Pathology and Laboratory Medicine (Anatomical Pathology, Cytogenetics), MCP Hahnemann University School of Medicine and St. Christopher's Hospital for Children, Erie Avenue at Front Street, Philadelphia, PA 19134, USA
2. Department of Surgery, MCP Hahnemann University School of Medicine and St. Christopher's Hospital for Children, Erie Avenue at Front Street, Philadelphia, PA 19134, USA
3. Department of Surgery, Alfred I. duPont Hospital for Children, 1600 Rockland Road, Wilmington, DE 19803.
4. Department of Pediatrics (Gastroenterology and Nutrition, and Diagnostic Referral), MCP Hahnemann University School of Medicine and St. Christopher's Hospital for Children, Erie Avenue at Front Street, Philadelphia, PA 19134, USA
5. Department of Pediatrics, Alfred I. duPont Hospital for Children, 1600 Rockland Road, Wilmington, DE 19803.
6. Department of Genetics, University of Pennsylvania, 3400 Spruce Street, Philadelphia, PA 19104, USA