Submitted on: 19 October 2003.
Revised on: 16 February 2004.
Accepted on: 12 March 2004.
___________________Boletin de Pediatria---EDICIONES ERGON SA
Submitted on: 23 June 2017.
Revised on: 05 August 2017.
Accepted on: 25 August 2017.
___________________Boletin de Pediatria---EDICIONES ERGON SA
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Submitted on: 12 September 2024.
Revised on: 03 December 2024.
Accepted on: 15 December 2024.
___________________Boletin de Pediatria---EDICIONES ERGON SA
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Submitted on: 11 June 2007.
Revised on: 02 July 2007.
Accepted on: 21 July 2007.
___________________Boletin de Pediatria---EDICIONES ERGON SA
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Submitted on: 08 December 1998.
Revised on: 12 February 1999.
Accepted on: 20 March 1999.
___________________Boletin de Pediatria---EDICIONES ERGON SA