1. Department of Health Education, CommunityHealth, Chicago, IL, USA
2. Health Services Research & Development, VA Puget Sound Health Care System, Seattle, WA, USA
3. Department of Health Services, School of Public Health, University of Washington, Seattle, WA, USA
4. Department of Quality, Research, & Evaluation, Planetree, Derby, CT, USA
5. Department of Health Services, Policy, & Practice, Brown University, Providence, RI, USA