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Population and Economics 2(2): 190-212
doi:
10.3897/popecon.2.e36053
Published:
07 Jul 2018
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Authors
G. Kotelnikov
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Samara State Medical University, Russia
Samara State Medical University, Russia
Samara State Medical University, Russia
Conflict of interest
The authors have declared that no competing interests exist.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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