1. Stead Family Department of Pediatrics, University of Iowa, Iowa City
2. Vermont Oxford Network, Burlington
3. Department of Pediatrics, University of Vermont College of Medicine, Burlington
4. Biostatistics and Epidemiology Division, RTI International, Research Triangle Park, North Carolina
5. Center for Clinical Research & Evidence-Based Medicine, University of Texas McGovern Medical School, Houston
6. Department of Pediatrics, Emory University School of Medicine, Atlanta, Georgia
7. Department of Pediatrics, University of Alabama, Birmingham
8. Department of Pediatrics, Duke University School of Medicine, Durham, North Carolina
9. Department of Mathematics and Statistics, College of Engineering and Mathematical Sciences, University of Vermont, Burlington
10. Department of Pediatrics, Stanford University School of Medicine, Palo Alto, California
11. Department of Pediatrics, Case Western Reserve University, Cleveland, Ohio
12. Biostatistics and Epidemiology Division, RTI International, Rockville, Maryland
13. Office of Research, George Mason University College of Health and Human Services, Fairfax, Virginia