1. Department of Surgery, Division of Pediatric Surgery, University of Southern California Keck School of Medicine and Childrens Hospital Los Angeles, Division of Pediatric Surgery, Los Angeles, California.
2. With Confidence Ltd., Surrey, United Kingdom.
3. Division of Pediatric Surgery, University of Pittsburgh School of Medicine, Children's Hospital of Pittsburgh, Pittsburgh, Pennsylvania.
4. ETHICON, Inc., Somerville, New Jersey.