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Submitted on: 22 August 2011.
Revised on: 09 November 2011.
Accepted on: 14 December 2011.
___________________Frontiers in Bioscience-Landmark
Submitted on: 22 October 2007.
Revised on: 23 December 2007.
Accepted on: 04 February 2008.
___________________Frontiers in Bioscience-Landmark
Submitted on: 14 October 2003.
Revised on: 05 January 2004.
Accepted on: 12 February 2004.
___________________Frontiers in Bioscience-Landmark
Submitted on: 02 October 2014.
Revised on: 29 January 2015.
Accepted on: 12 March 2015.
___________________Frontiers in Bioscience-Landmark