1. a Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, 1095 Willowdale Road, Morgantown, WV 26505-2888
2. b West Virginia University, College of Engineering and Mineral Resources, Industrial and Management Systems Engineering, P.O. Box 6107, Morgantown, WV 26506
3. c Formerly with West Virginia University (current address: 850 South Durkin Drive, Springfield, IL 62704)