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Submitted on: 08 August 2015.
Revised on: 28 November 2015.
Accepted on: 24 January 2016.
___________________British Journal of Learning Disabilities
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Submitted on: 12 November 2016.
Revised on: 20 January 2017.
Accepted on: 18 March 2017.
___________________British Journal of Learning Disabilities
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Submitted on: 25 November 2005.
Revised on: 22 January 2006.
Accepted on: 01 February 2006.
___________________British Journal of Learning Disabilities
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