Submitted on: 16 April 2019.
Revised on: 28 May 2019.
Accepted on: 28 June 2019.
___________________Endoscopy International Open---GEORG THIEME VERLAG KG
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Submitted on: 28 July 2011.
Revised on: 11 November 2011.
Accepted on: 04 December 2011.
___________________Endoscopy International Open---GEORG THIEME VERLAG KG
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Submitted on: 25 February 2002.
Revised on: 07 June 2002.
Accepted on: 06 August 2002.
___________________Endoscopy International Open---GEORG THIEME VERLAG KG
Submitted on: 03 November 2001.
Revised on: 11 January 2002.
Accepted on: 23 January 2002.
___________________Endoscopy International Open---GEORG THIEME VERLAG KG
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