Submitted on: 08 September 2012.
Revised on: 16 November 2012.
Accepted on: 04 January 2013.
___________________Journal of IMAB---PEYTCHINSKI PUBLISHING LTD
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Submitted on: 29 September 2009.
Revised on: 31 October 2009.
Accepted on: 26 November 2009.
___________________Journal of IMAB---PEYTCHINSKI PUBLISHING LTD
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