- Correspondence to Dr Jidong Huang, Institute for Health Research and Policy, University of Illinois at Chicago, 1747 West Roosevelt Rd, Chicago, IL 60608, USA;
- Received January 9, 2014
- Revised March 18, 2014
- Accepted March 19, 2014
- First published June 16, 2014.
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.