1. Department of Animal and Food Sciences, College of Agricultural Sciences and Natural Resources, Texas Tech University, Lubbock 79409-2141
2. Division of Pediatric Critical Care, School of Medicine, University of Colorado Denver, Aurora 80045
3. Integrated Livestock Management, Department of Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, 1678 Campus Delivery, Fort Collins 80523-1678
4. Department of Animal Sciences, The College of Agricultural Sciences, Colorado State University, Fort Collins 80523-1171