1. Harvard Pediatric Health Services Research Fellowship Program, Children's Hospital Boston, Boston,
2. Department of Pediatrics, Boston Medical Center, Boston University School of Medicine, Boston
3. Boston University School of Public Health, Boston, Center for Health Quality, Outcomes and Economic Research, ENRM Veterans Affairs Medical Center, Bedford, Massachusetts
4. Center for Child Health Care Studies, Department of Ambulatory Care and Prevention, Harvard Pilgrim Health Care and Harvard Medical School, Boston
5. Harvard Pediatric Health Services Research Fellowship Program, Children's Hospital Boston, Boston, Center for Child Health Care Studies, Department of Ambulatory Care and Prevention, Harvard Pilgrim Health Care and Harvard Medical School, Boston, Division of General Pediatrics, Children's Hospital Boston