- Correspondence to Dr James F Pankow, Department of Civil and Environmental Engineering, Portland State University, PO 751, Portland, OR 97207-0751, USA;
- Received 2 December 2014
- Accepted 25 February 2015
- Published in print 1 April 2016.
- Published online 31 March 2016.
- Published first 15 April 2015.
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