1. Division of Occupational and Environmental Medicine; Department of Community and Family Medicine; Duke University; Durham; North Carolina
2. Department of Industrial and Systems Engineering; School of Biomedical Engineering and Sciences; Virginia Tech; Blacksburg, Virginia
3. Department of Biomedical Sciences and Pathobiology; Virginia-Maryland Regional College of Veterinary Medicine; Virginia Tech; Blacksburg, Virginia
4. Division of Public Health; North Carolina Department of Health and Human Services; Raleigh; North Carolina
5. Department of Occupational Health Sciences; University of Texas Health Science Center at Tyler; Tyler; Texas