1. Department of Health, Behavior and Society, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
2. Asthma & Airway Disease Research Center, University of Arizona Health Sciences, University of Arizona, Tucson, AZ, USA
3. Maricopa County Department of Public Health, Phoenix, AZ, USA
4. Department of Epidemiology and Biostatistics, Mel and Enid Zuckerman College of Public Health, University of Arizona, Tucson, AZ, USA
5. Office of the Vice Chancellor for Health Affairs, University of Illinois Chicago, Chicago, IL, USA