- 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 January 7, 2014
- Accepted January 8, 2014
- First published February 5, 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.
Files in this Data Supplement:
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.