Submitted on: 23 December 1999.
Revised on: 12 February 2000.
Accepted on: 05 April 2000.
___________________Infectious Agents and Cancer---BMC
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Submitted on: 09 July 2013.
Revised on: 24 September 2013.
Accepted on: 13 October 2013.
___________________Infectious Agents and Cancer---BMC