1. Division of Systems Medicine, Department of Pediatrics, Stanford University School of Medicine, 251 Campus Drive, Stanford, CA 94305–5415, USA.
2. Training Program in Biomedical Informatics, Stanford University School of Medicine, Stanford, CA 94305–5479, USA.
3. Lucile Packard Children’s Hospital, 725 Welch Road, Palo Alto, CA 94304, USA.
4. Stanford Comprehensive Cancer Center, Stanford School of Medicine, Stanford, CA 94305, USA.
5. Cancer Biology Program, Stanford University School of Medicine, Stanford, CA 94305, USA.
6. Department of Genetics, Stanford University, Stanford, CA 94305, USA.