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Submitted on: 21 September 2000.
Revised on: 20 November 2000.
Accepted on: 01 December 2000.
___________________IET Nanobiotechnology---WILEY-HINDAWI
Submitted on: 12 February 2019.
Revised on: 20 March 2019.
Accepted on: 16 April 2019.
___________________IET Nanobiotechnology---WILEY-HINDAWI
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