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Submitted on: 15 July 2002.
Revised on: 06 October 2002.
Accepted on: 04 December 2002.
___________________Journal of Clinical Neonatology
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Submitted on: 09 March 2004.
Revised on: 03 July 2004.
Accepted on: 28 July 2004.
___________________Journal of Clinical Neonatology
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