1. Quantitative Sciences Unit, Department of Medicine, Stanford University School of Medicine , Stanford, CA, USA
2. Division of Oncology, Department of Medicine, Stanford University School of Medicine , Stanford, CA, USA
3. Division of Gastroenterology and Hepatology, Department of Medicine, Stanford University School of Medicine , Stanford, CA, USA
4. Palo Alto Medical Foundation Research Institute, Palo Alto Medical Foundation , Palo Alto, CA, USA
5. Stanford Cancer Institute , Stanford, CA, USA
6. Cancer Epidemiology Program, University of Hawaii Cancer Center , Honolulu, HI, USA
7. Department of Epidemiology and Biostatistics, University of California , San Francisco, CA, USA
8. Department of Epidemiology and Population Health, Stanford University School of Medicine , Stanford, CA, USA
9. Department of Neurosurgery, Stanford University School of Medicine , Stanford, CA, USA