1. Department of Pediatrics, Indiana University School of Medicine, Indianapolis, IN;
2. Melvin and Bren Simon Cancer Center, Indiana University, Indianapolis, IN;
3. The Emmes Corporation, Rockville, MD;
4. Division of Biostatistics, Medical College of Wisconsin, Milwaukee, WI;
5. Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA; and
6. Department of Pediatrics, University of Michigan Medical School, Ann Arbor, MI