- Correspondence to Dr Sammy Zahran, Department of Economics, Colorado State University, C132A Clark Building, Fort Collins, CO 80523-1771, USA;
- Received 6 January 2014
- Revised 11 March 2014
- Accepted 21 March 2014
- Published in print 1 August 2014.
- Published online 3 July 2014.
- Published first 8 May 2014.
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