- Correspondence to Dr John A Tauras, Department of Economics, University of Illinois at Chicago, 601 S. Morgan (m/c 144), Chicago, IL 60607, USA;
- Received 7 January 2014
- Accepted 8 January 2014
- Published online 17 February 2014.
BMJ Publishing Group Limited takes no responsibility for the accuracy of the translation from the published English original and is not liable for any errors which may occur.
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