?:authorAffiliation
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[\'Department of Internal Medicine, Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, Iowa, USA.\', \'Division of Pulmonary, Critical Care and Occupational Medicine, Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, Iowa, USA.\', \'Iowa City VA Health Care System, Iowa City, Iowa, USA.\', \'Department of Occupational and Environmental Health, College of Public Health, University of Iowa, Iowa City, Iowa, USA.\']
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