Submitted on: 01 January 2009.
Revised on: 28 January 2009.
Accepted on: 11 March 2009.
___________________Endoscopy International Open---GEORG THIEME VERLAG KG
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Submitted on: 03 October 2003.
Revised on: 22 November 2003.
Accepted on: 04 December 2003.
___________________Endoscopy International Open---GEORG THIEME VERLAG KG
Submitted on: 31 August 2015.
Revised on: 02 December 2015.
Accepted on: 25 January 2016.
___________________Endoscopy International Open---GEORG THIEME VERLAG KG
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