* Department of Surgery, UCLA School of Medicine, Los Angeles, California, USA **Correspondence address: Eric W Fonkalsrud, MD, Department of Surgery, UCLA Medical Center, 10833 LeConte Ave, Los Angeles CA 90095, USA. Received January 18, 2002; revised March 28, 2002; accepted April 22, 2002. ☆No competing interests declared. Presented at the Pacific Association of Pediatric Surgeons Annual Meeting, San Diego, CA, May 2002.
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Fonkalsrud et al. (2002) studied this question.