Submitted on: 11 January 2003.
Revised on: 30 March 2003.
Accepted on: 23 April 2003.
___________________JOURNAL OF INTELLECTUAL DISABILITY RESEARCH
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Submitted on: 07 March 2005.
Revised on: 09 April 2005.
Accepted on: 21 April 2005.
___________________JOURNAL OF INTELLECTUAL DISABILITY RESEARCH
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Submitted on: 31 March 2004.
Revised on: 06 June 2004.
Accepted on: 18 June 2004.
___________________JOURNAL OF INTELLECTUAL DISABILITY RESEARCH