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Submitted on: 10 August 2012.
Revised on: 06 December 2012.
Accepted on: 04 January 2013.
___________________Global Spine Journal---SAGE PUBLICATIONS LTD
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Submitted on: 08 December 2017.
Revised on: 02 January 2018.
Accepted on: 22 January 2018.
___________________Global Spine Journal---SAGE PUBLICATIONS LTD