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Submitted on: 16 August 2000.
Revised on: 22 September 2000.
Accepted on: 15 October 2000.
Particle and Fibre Toxicology
Submitted on: 21 November 2005.
Revised on: 27 December 2005.
Accepted on: 09 January 2006.
Particle and Fibre Toxicology---BMC
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