[1] Univ Calif San Francisco, Dept Urol, Philip R Lee Inst Hlth Policy Studies, San Francisco, CA 94143 USA
[2] Univ Calif San Francisco, Dept Epidemiol & Biostat, San Francisco, CA 94143 USA
[3] Univ Calif San Francisco, Helen Diller Family Comprehens Canc Ctr, San Francisco, CA 94143 USA
[4] Univ Calif Berkeley, Sch Publ Hlth, Berkeley, CA 94720 USA