1. Department of Pediatric Hematology-Oncology, Stanford University, Palo Alto, California.
2. Division of Communicable Disease Control, California Department of Public Health, Richmond, California.
3. Department of Pediatric Radiology, Stanford University, Palo Alto, California.
4. Department of Radiation Oncology, Stanford University, Palo Alto, California.
5. Department of Pathology, Stanford University, Palo Alto, California.