http://reply.papertrans.cn/1/5/435/435-21.png
http://reply.papertrans.cn/1/5/435/435-22.png
http://reply.papertrans.cn/1/5/435/435-23.png
Submitted on: 05 December 2005.
Revised on: 13 February 2006.
Accepted on: 18 March 2006.
___________________Acta Pediatrica de Mexico---INST NAC PEDIATRIA
http://reply.papertrans.cn/1/5/435/435-25.png
Submitted on: 11 May 2018.
Revised on: 27 June 2018.
Accepted on: 09 July 2018.
___________________Acta Pediatrica de Mexico---INST NAC PEDIATRIA
Submitted on: 31 October 2008.
Revised on: 20 December 2008.
Accepted on: 14 January 2009.
___________________Acta Pediatrica de Mexico---INST NAC PEDIATRIA
http://reply.papertrans.cn/1/5/435/435-28.png
http://reply.papertrans.cn/1/5/435/435-29.png
Submitted on: 02 July 2008.
Revised on: 17 October 2008.
Accepted on: 22 November 2008.
___________________Acta Pediatrica de Mexico---INST NAC PEDIATRIA