Submitted on: 07 May 1999.
Revised on: 08 August 1999.
Accepted on: 03 September 1999.
___________________Current Stem Cell Research & Therapy
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Submitted on: 16 March 2010.
Revised on: 30 May 2010.
Accepted on: 21 July 2010.
___________________Current Stem Cell Research & Therapy
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