Submitted on: 19 March 2011.
Revised on: 23 April 2011.
Accepted on: 07 May 2011.
___________________Gastrointestinal Disorders---MDPI
Submitted on: 10 November 2007.
Revised on: 13 January 2008.
Accepted on: 02 March 2008.
___________________Gastrointestinal Disorders---MDPI
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http://reply.papertrans.cn/2/104/10390/10390-24.png
Submitted on: 01 September 2003.
Revised on: 01 November 2003.
Accepted on: 19 November 2003.
___________________Gastrointestinal Disorders---MDPI
http://reply.papertrans.cn/2/104/10390/10390-26.png
http://reply.papertrans.cn/2/104/10390/10390-27.png
Submitted on: 25 July 2011.
Revised on: 23 October 2011.
Accepted on: 13 December 2011.
___________________Gastrointestinal Disorders---MDPI
http://reply.papertrans.cn/2/104/10390/10390-29.png
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