1. From the Department of Pediatrics, University of Vermont College of Medicine, Burlington, Vermont;
2. Pediatric Research in Office Settings, American Academy of Pediatrics, Elk Grove Village, Illinois;
3. Departments of Pediatrics and Psychiatry, University of Pittsburgh, School of Medicine, Pittsburgh, Pennsylvania;
4. Department of Family Medicine, University of Colorado Health Sciences Center, Denver, Colorado; and
5. Ambulatory Sentinel Practice Network, Denver, Colorado.