1. Department of Biotechnology, The Catholic University of Korea, 43-1 Yeokgok Dong, Wonmi-Ku, Bucheon, 420-743, Korea.
2. Department of Medicine, Sunkyunkwan University School of Medicine, Cardiac and Vascular Center, Samsung Medical Center, 50 Il-Won Dong, Kangnam-Ku, Seoul 135-710, Korea.
3. Division of Hepatitis and Poliovirus, Department of Virology, National Institute of Health, 5 Nokbun Dong, Eunpyung Ku, Seoul, 136-701, Korea.