1. Central Brain Tumor Registry of the United States , Hinsdale, IL , 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. Trans Divisional Research Program (TDRP), Division of Cancer Epidemiology and Genetics (DCEG), National Cancer Institute , Bethesda, MD , USA
5. Center for Biomedical Informatics & Information Technology (CBIIT), National Cancer Institute , Bethesda, MD , USA