1. Department of Psychiatry and Behavioral SciencesDuke University Medical CenterDurhamNCUSA
2. Division of NeurologyDepartment of MedicineDuke University Medical CenterDurhamNCUSA
3. Institute for Social ResearchUniversity of MichiganAnn ArborMIUSA
4. Division of General MedicineDepartment of MedicineUniversity of MichiganAnn ArborMIUSA
5. Veterans Affairs Center for Practice Management and Outcomes ResearchAnn ArborMIUSA
6. Institute of Public HealthUniversity of CambridgeCambridgeUnited Kingdom