Submitted on: 22 July 1999.
Revised on: 26 September 1999.
Accepted on: 09 October 1999.
___________________Journal of Pediatric Health Care
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Submitted on: 15 March 2015.
Revised on: 10 April 2015.
Accepted on: 24 May 2015.
___________________Journal of Pediatric Health Care
http://reply.papertrans.cn/2/187/18603/18603-34.png
Submitted on: 07 December 2007.
Revised on: 27 January 2008.
Accepted on: 11 February 2008.
___________________Journal of Pediatric Health Care
Submitted on: 16 May 2008.
Revised on: 18 July 2008.
Accepted on: 06 August 2008.
___________________Journal of Pediatric Health Care