[1] Ohio State Univ, Comprehens Canc Ctr, Columbus, OH 43210 USA
[2] Ohio State Univ, Coll Med, Dept Internal Med, Div Canc Prevent & Control, Columbus, OH 43210 USA
[3] Ohio State Univ, Coll Publ Hlth, Div Epidemiol, Columbus, OH USA
[4] Univ Calif San Francisco, Helen Diller Family Comprehens Canc Ctr, San Francisco, CA 94143 USA
[5] Univ Calif San Francisco, Sch Med, Dept Epidemiol & Biostat, San Francisco, CA 94143 USA