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Submitted on: 12 March 2003.
Revised on: 24 May 2003.
Accepted on: 21 July 2003.
___________________Journal of Radiation Protection and Research
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Submitted on: 26 April 2008.
Revised on: 26 May 2008.
Accepted on: 23 June 2008.
___________________Journal of Radiation Protection and Research