1. Department of Medicine, School of Medicine, Indiana University, Indianapolis, Indiana
2. The Biostatistics Center, Milken Institute School of Public Health, George Washington University, Washington, DC
3. College of Osteopathic Medicine, Marian University, Indianapolis, Indiana
4. Department of Pediatrics, School of Medicine, University of Colorado Denver, Colorado
5. Department of Medicine, Keck School of Medicine, University of Southern California, Los Angeles, California
6. Department of Medicine, VA Puget Sound Health Care System, University of Washington, Seattle, Washington
7. Department of Pediatrics, School of Medicine, University of Pittsburgh, Pennsylvania
8. Department of Pediatrics, School of Medicine, Yale University, New Haven, Connecticut