1. Division of Enteric and Hepatitis Viruses, Center for Infectious Diseases, National Institute of Health, Korea Center for Disease Control and Prevention, 5 Nokbun-dong, Eunpyung-gu, Seoul 122-701, South Korea
2. Department of Pediatrics, Catholic University College of Medicine, Suwon, South Korea
3. iNtRON Biotechnology, Inc., Room 903, JungAng Induspia V, 138-6, Sangdaewon-Dong, Jungwon-gu, Seongnam-si, Gyeonggi-do 462-120, South Korea