1. Department of Urology; David Geffen School of Medicine; University of California at Los Angeles; Los Angeles California
2. Department of Epidemiology; David Geffen School of Medicine; University of California at Los Angeles; Los Angeles California
3. Division of Urology; School of Medicine; University of Pennsylvania; Philadelphia Pennsylvania
4. City of Los Angeles; Department of Aging; Los Angeles California
5. Department of Medicine; David Geffen School of Medicine; University of California at Los Angeles; Los Angeles California
6. Veterans Administration Greater Los Angeles Healthcare System Geriatric Research Education Clinical Center; Los Angeles California