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Submitted on: 11 September 2004.
Revised on: 04 December 2004.
Accepted on: 21 January 2005.
___________________CANCER CAUSES & CONTROL---SPRINGER
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Submitted on: 16 March 2005.
Revised on: 27 June 2005.
Accepted on: 19 July 2005.
___________________CANCER CAUSES & CONTROL---SPRINGER
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Submitted on: 31 July 2001.
Revised on: 08 October 2001.
Accepted on: 25 November 2001.
___________________CANCER CAUSES & CONTROL---SPRINGER