Submitted on: 06 July 2007.
Revised on: 30 August 2007.
Accepted on: 20 September 2007.
___________________JOURNAL OF NANOBIOTECHNOLOGY---BMC
Submitted on: 10 November 2011.
Revised on: 12 February 2012.
Accepted on: 25 February 2012.
___________________JOURNAL OF NANOBIOTECHNOLOGY---BMC
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Submitted on: 18 May 2018.
Revised on: 29 June 2018.
Accepted on: 27 July 2018.
___________________JOURNAL OF NANOBIOTECHNOLOGY---BMC