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Submitted on: 30 July 2000.
Revised on: 27 October 2000.
Accepted on: 28 November 2000.
___________________ANTICANCER RESEARCH---INT INST ANTICANCER RESEARCH
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Submitted on: 30 October 2001.
Revised on: 05 December 2001.
Accepted on: 09 January 2002.
___________________ANTICANCER RESEARCH---INT INST ANTICANCER RESEARCH
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