*Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, 50 Irwon-dong, Kangnam-ku, Seoul 135-710, Korea; †Department of Internal Medicine, Yale University School of Medicine, 333 Cedar Street, TMP532, P.O. Box 208020, New Haven, CT 06520-8020; and §Department of Pharmacology, School of Medicine, University of California at San Diego, 9500 Gilman Drive, La Jo...