1. From the Department of General Pediatrics and Adolescent Medicine, Children's National Medical Center, Washington, DC;
2. Center for Health Services and Clinical Research, Children's Research Institute, Children's National Medical Center, Washington, DC;
3. Department of Pediatrics, George Washington University School of Medicine and Health Sciences, Washington, DC;
4. Department of Pediatrics, University of Maryland School of Medicine, Baltimore, MD; and
5. Association of SIDS and Infant Mortality Programs, Baltimore, MD.