1. Greater Bay Area Cancer Registry, University of California , San Francisco, CA, USA
2. Department of Epidemiology & Biostatistics, University of California , San Francisco, CA, USA
3. Helen Diller Family Comprehensive Cancer Center, University of California , San Francisco, CA, USA
4. Greater Bay Area Cancer Registry, University of California , San Francisco, CA, USA
5. Department of Epidemiology & Biostatistics, University of California , San Francisco, CA, USA
6. Helen Diller Family Comprehensive Cancer Center, University of California , San Francisco, CA, USA