- Correspondence to Dr James P Smith, the RAND Corporation, 1776 Main Street, Santa Monica, CA 90407, USA;
- Accepted August 11, 2010
- First published October 1, 2010.
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.