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Submitted on: 09 March 2005.
Revised on: 20 March 2005.
Accepted on: 14 April 2005.
Revista Colombiana de Cancerologia
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Submitted on: 14 December 1998.
Revised on: 04 January 1999.
Accepted on: 27 January 1999.
Revista Colombiana de Cancerologia
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