| Affiliation: | 1. Division of Field Studies and Engineering, National Institute for Occupational Safety and Health, Cincinnati, Ohio, USA;2. Center for Fire, Rescue, and EMS Health Research, NDRI-USA, Inc, Leawood, Kansas, USA;3. Division of Birth Defects and Infant Disorders, National Center on Birth Defects and Developmental Disabilities, CDC, Atlanta, Georgia, USA;4. Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA |
