Submitted on: 19 January 2005.
Revised on: 30 January 2005.
Accepted on: 04 February 2005.
Tumour Virus Research---ELSEVIER
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Submitted on: 26 March 2004.
Revised on: 02 May 2004.
Accepted on: 25 May 2004.
Tumour Virus Research---ELSEVIER