Submitted on: 22 September 2007.
Revised on: 13 November 2007.
Accepted on: 10 January 2008.
___________________HEALTH PHYSICS---LIPPINCOTT WILLIAMS & WILKINS
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Submitted on: 06 October 2004.
Revised on: 11 January 2005.
Accepted on: 03 February 2005.
___________________HEALTH PHYSICS---LIPPINCOTT WILLIAMS & WILKINS
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Submitted on: 11 September 2006.
Revised on: 02 November 2006.
Accepted on: 17 December 2006.
___________________HEALTH PHYSICS---LIPPINCOTT WILLIAMS & WILKINS