- Correspondence to Dr Gretchen E Potts, Department of Chemistry, The University of Tennessee at Chattanooga, 615 McCallie Avenue, #2252, Chattanooga, TN 37403, USA;
- Received 19 September 2010
- Accepted 25 January 2011
- Published in print 1 May 2011.
- Published online 18 April 2011.
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