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Submitted on: 02 October 2004.
Revised on: 01 January 2005.
Accepted on: 26 January 2005.
___________________CIRCULATION RESEARCH---LIPPINCOTT WILLIAMS & WILKINS
Submitted on: 07 June 1998.
Revised on: 24 August 1998.
Accepted on: 04 September 1998.
___________________CIRCULATION RESEARCH---LIPPINCOTT WILLIAMS & WILKINS
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