1. Division of Cardiology, Samsung Medical Center, Samsung Biomedical Research Institute; Sungkyunkwan University School of Medicine; 50 Irwon dong, Gangnam-gu, Seoul, 135-710; Korea
2. Department of Medicine; University of California, San Diego Department of Cardiology; San Diego, California; USA
3. Research and Development Center; Celltrion, 13-6 Songdo-dong, Yeonsu-gu, Incheon 406-840; Korea