1. Department of Surgery University of Pittsburgh School of Medicine Pittsburgh Pennsylvania USA
2. Division of Pediatric Surgery UPMC Children’s Hospital of Pittsburgh University of Pittsburgh Medical Center Pittsburgh Pennsylvania USA
3. Department of Pathology UPMC Children’s Hospital of Pittsburgh University of Pittsburgh Medical Center Pittsburgh Pennsylvania USA
4. Division of Gastroenterology UPMC Children’s Hospital of Pittsburgh University of Pittsburgh Medical Center Pittsburgh Pennsylvania USA
5. Jacobs School of Medicine and Biomedical Sciences University at Buffalo Buffalo New York USA
6. Center for Biologic Imaging University of Pittsburgh Pittsburgh Pennsylvania USA