Submitted on: 26 August 1999.
Revised on: 29 November 1999.
Accepted on: 16 December 1999.
___________________Journal of Pediatric Surgery---W B SAUNDERS CO-ELSEVIER INC
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Submitted on: 10 April 2005.
Revised on: 02 June 2005.
Accepted on: 13 July 2005.
___________________Journal of Pediatric Surgery---W B SAUNDERS CO-ELSEVIER INC
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Submitted on: 06 July 2007.
Revised on: 21 September 2007.
Accepted on: 10 October 2007.
___________________Journal of Pediatric Surgery---W B SAUNDERS CO-ELSEVIER INC