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Submitted on: 08 October 2016.
Revised on: 19 November 2016.
Accepted on: 20 December 2016.
___________________JOURNAL OF INTELLECTUAL & DEVELOPMENTAL DISABILITY
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http://reply.papertrans.cn/2/175/17443/17443-34.png
Submitted on: 23 January 2008.
Revised on: 31 March 2008.
Accepted on: 17 April 2008.
___________________JOURNAL OF INTELLECTUAL & DEVELOPMENTAL DISABILITY
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