[1] Inst Publ Hlth, Calif Canc Registry, Sacramento, CA USA
[2] Univ Calif Davis, Dept Publ Hlth Sci, Div Epidemiol, Sacramento, CA 95817 USA
[3] Univ Calif Davis, Med Ctr, Div Surg Oncol, Davis, CA USA
[4] Univ Calif San Francisco, Dept Epidemiol & Biostat, Div Canc Epidemiol, San Francisco, CA 94143 USA