Submitted on: 14 March 2009.
Revised on: 02 July 2009.
Accepted on: 20 July 2009.
___________________AJIDD-American Journal on Intellectual and Developmental Disabilities
http://reply.papertrans.cn/1/12/1104/1104-22.png
Submitted on: 15 December 2002.
Revised on: 03 April 2003.
Accepted on: 08 May 2003.
___________________AJIDD-American Journal on Intellectual and Developmental Disabilities
Submitted on: 08 March 2017.
Revised on: 12 May 2017.
Accepted on: 08 June 2017.
___________________AJIDD-American Journal on Intellectual and Developmental Disabilities
http://reply.papertrans.cn/1/12/1104/1104-25.png
Submitted on: 03 January 2019.
Revised on: 04 March 2019.
Accepted on: 20 April 2019.
___________________AJIDD-American Journal on Intellectual and Developmental Disabilities
http://reply.papertrans.cn/1/12/1104/1104-27.png
http://reply.papertrans.cn/1/12/1104/1104-28.png
Submitted on: 21 January 2018.
Revised on: 11 March 2018.
Accepted on: 01 May 2018.
___________________AJIDD-American Journal on Intellectual and Developmental Disabilities
http://reply.papertrans.cn/1/12/1104/1104-30.png