1. The Preston Robert Tisch Brain Tumor Center, Duke University School of Medicine , Durham, North Carolina , USA
2. Department of Neurosurgery, Duke University School of Medicine , Durham, North Carolina , USA
3. Central Brain Tumor Registry of the United States , Hinsdale, Illinois , USA
4. Duke Cancer Institute, Duke University Medical Center , Durham, North Carolina , USA
5. Trans Divisional Research Program (TDRP), Division of Cancer Epidemiology and Genetics (DCEG), National Cancer Institute , Bethesda, Maryland , USA
6. Center for Biomedical Informatics & Information Technology (CBIIT), National Cancer Institute , Bethesda, Maryland, USA