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