1. Division of General MedicineDepartment of MedicineUniversity of MichiganAnn ArborMIUSA
2. Veterans Affairs Center for Practice Management and Outcomes ResearchAnn ArborMIUSA
3. Institute for Social ResearchUniversity of MichiganAnn ArborMIUSA
4. Center for Health StudiesGroup Health Cooperative of Puget SoundSeattleWAUSA
5. Department of MedicineDivision of Geriatric MedicineUniversity of PennsylvaniaPhiladelphiaPAUSA
6. Department of EconomicsHarvard University, and the National Bureau of Economic ResearchCambridgeMAUSA
7. Department of PsychiatryBioethics Program, and Center for Behavioral and Decision Sciences in MedicineUniversity of MichiganAnn ArborMIUSA