1. Division of Chronic Disease and Injury Prevention, Los Angeles County Department of Public Health, 3530 Wilshire Boulevard, 8th Floor, Los Angeles, CA 90010, USA
2. Office of Health Assessment and Epidemiology, Los Angeles County Department of Public Health, 313 North Figueroa Street, Room 127, Los Angeles, CA 90012, USA
3. Department of Epidemiology, UCLA Jonathan and Karin Fielding School of Public Health, Box 951772, 71-254 CHS, Los Angeles, CA 90095-1772, USA
4. Department of Family Medicine, David Geffen School of Medicine at UCLA, 10880 Wilshire Boulevard, Suite 1800, Los Angeles, CA 90024-4142, USA