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