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Submitted on: 20 December 2016.
Revised on: 02 March 2017.
Accepted on: 06 April 2017.
___________________Electronic Commerce Research---SPRINGER
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Submitted on: 11 November 2012.
Revised on: 06 January 2013.
Accepted on: 12 February 2013.
___________________Electronic Commerce Research---SPRINGER
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