1Department of Environmental Medical Biology, Yonsei University College of Medicine, Seoul 120-752, Korea.
2Department of Clinical Pathology, Gwangju Health College, Gwangju 506-701, Korea.
3Institute of Global Disease Control and Department of Microbiology, College of Medicine, Konkuk University, Seoul 143-701, Korea. JFIF d d Ducky d qhttp://ns.adobe.com/xap/1.0/