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Submitted on: 15 January 2003.
Revised on: 18 February 2003.
Accepted on: 03 April 2003.
___________________Italian Journal of Pediatrics---BMC
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Submitted on: 29 March 2015.
Revised on: 16 May 2015.
Accepted on: 02 June 2015.
___________________Italian Journal of Pediatrics---BMC
Submitted on: 25 August 2019.
Revised on: 08 November 2019.
Accepted on: 28 December 2019.
___________________Italian Journal of Pediatrics---BMC
Submitted on: 21 January 2016.
Revised on: 23 April 2016.
Accepted on: 16 May 2016.
___________________Italian Journal of Pediatrics---BMC
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Submitted on: 07 March 2010.
Revised on: 18 May 2010.
Accepted on: 06 July 2010.
___________________Italian Journal of Pediatrics---BMC