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Submitted on: 11 November 2005.
Revised on: 18 January 2006.
Accepted on: 16 March 2006.
___________________Journal of Environmental Science and Health Part C-Toxicology and Carcinogenesis
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Submitted on: 17 August 2001.
Revised on: 13 November 2001.
Accepted on: 24 November 2001.
___________________Journal of Environmental Science and Health Part C-Toxicology and Carcinogenesis
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Submitted on: 23 October 1998.
Revised on: 23 January 1999.
Accepted on: 06 March 1999.
___________________Journal of Environmental Science and Health Part C-Toxicology and Carcinogenesis