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Nature Communications 2, Article number: 448 10.1038/ncomms1454(2011); Published: August232011; Updated: August3020120207
This article was published without any declaration of competing financial interests. A revised competing financial interests statement is provided below:
The authors declare competing financial interests. T.K. and J.A.T. are employees with InStep NanoPower, LLC. T.K. is a company President and J.A.T. is a company Vice President.
