1. RAND Corporation Pittsburgh Pennsylvania USA
2. Department of Family Medicine and Community Health University of Wisconsin Madison Wisconsin USA
3. RAND Corporation Santa Monica California USA
4. The Severyn Group Ashburn Virginia USA
5. Boston Children's Hospital Boston Massachusetts USA
6. Division of General Pediatrics Harvard Medical School Boston Massachusetts USA
7. Kaiser Permanente Bernard J. Tyson School of Medicine Pasadena California USA
8. Department of Health Policy and Management Yale University School of Public Health New Haven Connecticut USA