1. Department of Economics, US Naval Academy, Annapolis, Maryland
2. Department of Health Law, Policy & Management, Boston University School of Public Health, Boston, Massachusetts
3. School of Public Health, University of California, Berkeley
4. Institute of Health Policy, Management and Evaluation, University of Toronto, Ontario, Canada
5. Department of Agricultural & Resource Economics, University of California, Berkeley
6. Division of General Internal Medicine, Center for Vulnerable Populations, San Francisco General Hospital/University of California, San Francisco