1. Department of Epidemiology UCLA Fielding School of Public Health Los Angeles California USA
2. Department of Environmental Health Sciences UCLA Fielding School of Public Health Los Angeles California USA
3. Department of Pathology and Laboratory Medicine UCLA David Geffen School of Medicine Los Angeles California USA
4. Division of Pulmonary and Critical Care Medicine David Geffen School of Medicine at UCLA Los Angeles California USA
5. Departments of Epidemiology and Environmental Health Sciences, School of Public Health and Department of Urology Medical School, University of Michigan Ann Arbor Michigan USA