1. Department of Neurological Surgery, University of California San Francisco , San Francisco, California , USA
2. Department of Epidemiology and Biostatistics, University of California San Francisco , San Francisco, California , USA
3. Weill Institute for Neurosciences, University of California San Francisco , San Francisco, California , USA
4. Department of Epidemiology and Population Health, Stanford University , Stanford, California , USA
5. Stanford Cancer Institute, Stanford University , Stanford, California , USA