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Submitted on: 05 August 2006.
Revised on: 10 November 2006.
Accepted on: 21 November 2006.
___________________Frontiers of Medicine---SPRINGER
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Submitted on: 29 July 2015.
Revised on: 30 September 2015.
Accepted on: 01 November 2015.
___________________Frontiers of Medicine---SPRINGER
Submitted on: 23 October 2004.
Revised on: 21 January 2005.
Accepted on: 07 March 2005.
___________________Frontiers of Medicine---SPRINGER