1 Department of Epidemiology, University of Nebraska Medical Center, Omaha, NE, 68198, USA. [email protected].
2 Epidemiology Branch, Department of Health and Human Services, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC, USA.
3 Department of Internal Medicine, Division of Allergy and Immunology, University of Nebraska Medical Center, Omaha, NE, 68198, USA.
4 Department of Epidemiology, University of Nebraska Medical Center, Omaha, NE, 68198, USA.
5 Department of Biostatistics, University of Nebraska Medical Center, Omaha, NE, 68198, USA.
6 Westat, Durham, NC, USA.
7 Occupational and Environmental Epidemiology Branch, National Cancer Institute, Bethesda, MD, USA.
8 Respiratory Health Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, WV, USA.
9 Biostatistics and Computational Biology Branch, Department of Health and Human Services, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC, USA.
10 Department of Epidemiology, University of Nebraska Medical Center, Omaha, NE, 68198, USA. [email protected].
11 Department of Internal Medicine, Division of Pulmonary, Critical Care and Sleep, University of Nebraska Medical Center, Omaha, NE, 68198, USA. [email protected].