1. VA Puget Sound Health Care System Seattle Washington USA
2. Department of Medicine University of Washington Seattle Washington USA
3. Department of Medicine The University of Chicago Chicago Illinois USA
4. UPMC Children's Hospital of Pittsburgh University of Pittsburgh Pittsburgh Pennsylvania USA
5. Jesse Brown VA Medical Center Chicago Illinois USA
6. Department of Research & Evaluation Kaiser Permanente Southern California Pasadena California USA
7. Department of Pediatrics Yale University New Haven Connecticut USA
8. George Washington University Biostatistics Center Rockville Maryland USA
9. Department of Internal Medicine Indiana University School of Medicine Indianapolis Indiana USA
10. Department of Pediatrics University of Colorado Anschutz Medical Campus Aurora Colorado USA