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Submitted on: 15 April 1999.
Revised on: 31 July 1999.
Accepted on: 28 August 1999.
___________________Journal of Environmental Science and Health Part C-Toxicology and Carcinogenesis
Submitted on: 30 August 2009.
Revised on: 16 October 2009.
Accepted on: 09 December 2009.
___________________Journal of Environmental Science and Health Part C-Toxicology and Carcinogenesis
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Submitted on: 26 October 1998.
Revised on: 12 December 1998.
Accepted on: 08 February 1999.
___________________Journal of Environmental Science and Health Part C-Toxicology and Carcinogenesis
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