1. Department of Urology, David Geffen School of Medicine at UCLA, Los Angeles, California.
2. Department of Family Medicine, David Geffen School of Medicine at UCLA, Los Angeles, California.
3. Veterans Administration, Greater Los Angeles Healthcare System, Los Angeles, California.
4. RAND Corporation, Santa Monica, California.
5. Department of Community Health Sciences, UCLA Fielding School of Public Health, Los Angeles, California.
6. UC Irvine School of Medicine, Irvine, California.
7. Department of Health Policy and Management, UCLA Fielding School of Public Health, Los Angeles, California.