Integrated Research Center for Genome Polymorphism, Department of Microbiology, School of Medicine, Catholic University of Korea, Seoul 137-701, Korea.|Integrated Research Center for Genome Polymorphism, Department of Microbiology, School of Medicine, Catholic University of Korea, Seoul 137-701, Korea.|Integrated Research Center for Genome Polymorphism, Department of Microbiology, School of Medicine, Catholic University of Korea, Seoul 137-701, Korea.|Integrated Research Center for Genome Polymorphism, Department of Microbiology, School of Medicine, Catholic University of Korea, Seoul 137-701, Korea.|Integrated Research Center for Genome Polymorphism, Department of Microbiology, School of Medicine, Catholic University of Korea, Seoul 137-701, Korea.|Integrated Research Center for Genome Polymorphism, Department of Microbiology, School of Medicine, Catholic University of Korea, Seoul 137-701, Korea.