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Submitted on: 05 October 2008.
Revised on: 29 October 2008.
Accepted on: 09 November 2008.
Research in Developmental Disabilities
Submitted on: 05 April 1998.
Revised on: 03 May 1998.
Accepted on: 07 May 1998.
Research in Developmental Disabilities
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http://reply.papertrans.cn/3/265/26401/26401-25.png
Submitted on: 16 March 2007.
Revised on: 31 March 2007.
Accepted on: 14 April 2007.
Research in Developmental Disabilities
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Submitted on: 18 May 2014.
Revised on: 07 June 2014.
Accepted on: 15 June 2014.
Research in Developmental Disabilities
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Submitted on: 22 November 2015.
Revised on: 01 January 2016.
Accepted on: 06 January 2016.
Research in Developmental Disabilities