1. Department of Neurosurgery, Duke University School of Medicine , Durham, North Carolina , USA
2. The Preston Robert Tisch Brain Tumor Center, Duke University School of Medicine , Durham, NC
3. Duke Cancer Institute, Duke University Medical Center , Durham, North Carolina , USA
4. Central Brain Tumor Registry of the United States , Hinsdale, Illinois , USA
5. Department of Epidemiology and Population Health, Stanford University School of Medicine , Stanford, California , USA
6. Department of Translational Molecular Pathology and Department of Pathology, The University of Texas MD Anderson Cancer Center , Houston, Texas , USA
7. Department of Medicine, Section of Epidemiology and Population Sciences, and Institute for Clinical and Translational Research, Dan L. Duncan Comprehensive Cancer Center, Baylor College of Medicine , Houston, Texas , USA
8. Center for Biomedical Informatics & Information Technology and Division of Cancer Epidemiology and Genetics, National Cancer Institute , Bethesda, Maryland , USA