Submitted on: 30 April 2010.
Revised on: 17 August 2010.
Accepted on: 12 September 2010.
___________________Frontiers in Pediatrics---FRONTIERS MEDIA SA
Submitted on: 27 November 2009.
Revised on: 24 December 2009.
Accepted on: 24 January 2010.
___________________Frontiers in Pediatrics---FRONTIERS MEDIA SA
Submitted on: 11 October 2002.
Revised on: 26 November 2002.
Accepted on: 16 December 2002.
___________________Frontiers in Pediatrics---FRONTIERS MEDIA SA
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http://reply.papertrans.cn/2/103/10215/10215-15.png
Submitted on: 18 March 2013.
Revised on: 08 June 2013.
Accepted on: 26 June 2013.
___________________Frontiers in Pediatrics---FRONTIERS MEDIA SA
Submitted on: 30 April 2011.
Revised on: 03 July 2011.
Accepted on: 12 August 2011.
___________________Frontiers in Pediatrics---FRONTIERS MEDIA SA
http://reply.papertrans.cn/2/103/10215/10215-18.png
Submitted on: 04 September 2013.
Revised on: 10 November 2013.
Accepted on: 01 December 2013.
___________________Frontiers in Pediatrics---FRONTIERS MEDIA SA
Submitted on: 26 December 2019.
Revised on: 11 March 2020.
Accepted on: 03 May 2020.
___________________Frontiers in Pediatrics---FRONTIERS MEDIA SA