Submitted on: 13 January 2010.
Revised on: 08 March 2010.
Accepted on: 19 April 2010.
___________________Italian Journal of Pediatrics---BMC
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Submitted on: 18 October 1998.
Revised on: 14 November 1998.
Accepted on: 25 November 1998.
___________________Italian Journal of Pediatrics---BMC
Submitted on: 26 August 2010.
Revised on: 10 October 2010.
Accepted on: 01 November 2010.
___________________Italian Journal of Pediatrics---BMC
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Submitted on: 16 June 1999.
Revised on: 17 July 1999.
Accepted on: 30 July 1999.
___________________Italian Journal of Pediatrics---BMC
Submitted on: 31 July 2009.
Revised on: 14 October 2009.
Accepted on: 29 October 2009.
___________________Italian Journal of Pediatrics---BMC
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