1. Center for Health Quality, Outcomes, and Economic Research, Bedford, MA and Boston University,
2. Boston University and Center for Organization, Leadership, and Management Research, Boston, MA
3. Center for Health Quality, Outcomes, and Economic Research, Bedford, MA and Boston University
4. Center for Health Quality, Outcomes, and Economic Research, Bedford, MA
5. Harvard School of Public Health, Boston, MA
6. Stanford University and VA Palo Alto Healthcare System, Palo Alto, CA