Affiliation: | (1) Department of Internal Medicine, Seoul National University College of Medicine, 28 Yeongun-dong, Chongro-gu, 110-744, Seoul, Republic of Korea;(2) Department of Internal Medicine, Dankook University College of Medicine, San 16-5, Anseo-dong, Cheonan-si, 330-715, Chungnam, Republic of Korea;(3) Department of Laboratory Medicine, Seoul National University College of Medicine, 28 Yeongun-dong, Chongro-gu, 110-744, Seoul, Republic of Korea |