1. The Institute of Environmental and Human Health, Department of Environmental Toxicology, Texas Tech University, P.O. Box 41163, Lubbock, Texas 79416
2. Department of Biosystems and Agricultural Engineering, Oklahoma State University, 139 Agricultural Hall, Stillwater, Oklahoma 74078
3. Department of Animal and Food Sciences, P.O. Box 42141, Lubbock, Texas 79409
4. Department of Agricultural Education and Communications, Texas Tech University, P.O. Box 42131, Lubbock, Texas 79409
5. Department of Environmental Science, Baylor University, One Bear Place #97266, Waco, Texas 76798-7266