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Submitted on: 19 September 2014.
Revised on: 12 December 2014.
Accepted on: 28 January 2015.
___________________Endoscopy International Open---GEORG THIEME VERLAG KG
Submitted on: 12 July 2023.
Revised on: 22 September 2023.
Accepted on: 10 October 2023.
___________________Endoscopy International Open---GEORG THIEME VERLAG KG
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