1. Institute of Public Health, Georgia State University, Atlanta, Georgia (DGS, MSA, LL)
2. University of Medicine and Dentistry of New Jersey, School of Public Health, Department of Environmental and Occupational Health, Piscataway, New Jersey (DGS, SWK)
3. Environmental and Occupational Health Sciences Institute, University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School and Rutgers University, Piscataway, New Jersey (DGS)
4. Division of Respiratory Therapy, School of Health Professions, College of Health and Human Sciences, Georgia State University, Atlanta, Georgia (RDZ, LTG)