1. Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, TX;
2. Department of Hematology, St Jude Children's Research Hospital, Memphis, TN;
3. Clinical Trials & Surveys Corporation, Baltimore, MD;
4. Department of Pediatrics, University of Mississippi Medical Center, Jackson, MS;
5. Department of Radiology, Children's National Medical Center, Washington, DC;
6. Litron Corporation, Rochester, NY;
7. Department of Radiological Sciences, St Jude Children's Research Hospital, Memphis, TN;
8. Department of Radiology, Harbor-UCLA Medical Center, Los Angeles, CA;
9. Department of Pediatrics, Emory University, Atlanta, GA; and
10. Department of Pediatrics, SUNY-Downstate Medical Center/Kings County Hospital, Brooklyn, NY