- Correspondence to David M Hondula, Department of Environmental Sciences, University of Virginia, PO Box 400123, Charlottesville, VA 22904, USA;
- Received 9 November 2012
- Revised 5 March 2013
- Accepted 25 March 2013
- Published in print 1 August 2013.
- Published online 2 July 2013.
- Published first 25 April 2013.
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