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Submitted on: 25 April 2001.
Revised on: 08 June 2001.
Accepted on: 04 July 2001.
NICOTINE & TOBACCO RESEARCH---OXFORD UNIV PRESS
Submitted on: 10 February 2005.
Revised on: 13 March 2005.
Accepted on: 03 April 2005.
NICOTINE & TOBACCO RESEARCH