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Submitted on: 13 January 2006.
Revised on: 19 February 2006.
Accepted on: 17 March 2006.
npj Flexible Electronics---NATURE PORTFOLIO
Submitted on: 13 May 2011.
Revised on: 31 May 2011.
Accepted on: 12 June 2011.
npj Flexible Electronics---NATURE PORTFOLIO
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