1. Department of Epidemiology, School of Public Health, University of California, Los Angeles, CA, USA
2. Department of Family Medicine, David Geffen School of Medicine, University of California, Los Angeles, CA, USA
3. Division of Occupational and Environmental Medicine, Department of Medicine, University of California, San Francisco, CA, USA
4. Department of Public Health Sciences and Epidemiology, John A. Burns School of Medicine, University of Hawai'i at Mānoa, HI, USA
5. Occupational Health Branch, California Department of Health Services, Oakland, CA, USA