- Correspondence to Kenneth E Warner, Department of Health Management & Policy, School of Public Health, University of Michigan, 1415 Washington Heights, Ann Arbor, MI 48109-2029, USA;
- Received January 26, 2013
- Accepted February 21, 2013
- First published April 15, 2013.
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.