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Submitted on: 04 November 2003.
Revised on: 07 February 2004.
Accepted on: 13 March 2004.
___________________Cancer Drug Resistance---OAE PUBLISHING INC
Submitted on: 01 October 2011.
Revised on: 03 January 2012.
Accepted on: 15 February 2012.
___________________Cancer Drug Resistance---OAE PUBLISHING INC