1. Department of Microbiology and Research Institute for Medical Sciences, Infection Signaling Network Research Center, College of Medicine, Chungnam National University, Daejeon 301-747, South Korea
2. Division of Pulmonary and Critical Care Medicine, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 135-710, South Korea
3. Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin—Madison, 2015 Linden Drive, Madison, Wisconsin 53706-1102
4. Department of Veterinary Population Medicine, University of Minnesota, 301E Veterinary Science Building, 1971 Commonwealth Avenue, St. Paul, Minnesota 55108
5. College of Health Sciences, University of Wisconsin—Milwaukee, P.O. Box 413 Milwaukee, Wisconsin 53201-0413