From the Departments of Medicine (S.-J.P., S.C., Y.K.O., J.S.K., S.Y.J.), Thoracic and Cardiovascular Surgery (J.-H.Y., T.-G.J.), and Pediatrics (O.J.L., J.S., I.-S.K., J.H.), Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea. (2013-12時点)