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Submitted on: 24 August 2013.
Revised on: 14 October 2013.
Accepted on: 24 November 2013.
___________________HEALTH PHYSICS---LIPPINCOTT WILLIAMS & WILKINS
Submitted on: 26 January 2012.
Revised on: 01 March 2012.
Accepted on: 05 April 2012.
___________________HEALTH PHYSICS---LIPPINCOTT WILLIAMS & WILKINS
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Submitted on: 01 June 1999.
Revised on: 25 September 1999.
Accepted on: 26 October 1999.
___________________HEALTH PHYSICS---LIPPINCOTT WILLIAMS & WILKINS