- Correspondence to Daniel J Dutton, The Prentice Institute for Global Population & Economy, Suite L1184 (Library Information Network Centre), 4401 University Drive West, Lethbridge, Alberta, Canada T1K 3M4;
- Received March 17, 2015
- Revised September 4, 2015
- Accepted October 2, 2015
- First published December 8, 2015.
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