1. From Seoul National University Hospital (B.-K.K., J.K., D.H., H.-S.K.), Samsung Medical Center (J.-Y.H., J.-M.L.), and Kyung Hee University Hospital (W.K.), Seoul, Keimyung University Dongsan Medical Center (C.-W.N.) and Yeungnam University Medical Center (U.K.), Daegu, Inje University Ilsan Paik Hospital, Goyang (J.-H.D.), Kangwon National University Hospital, Chuncheon (B.-K.L.), Wonju Severance Christian Hospital, Wonju (S.-G.A.), Ajou University Hospital, Suwon (M.-H.Y., S.-J.T.), Uijeongbu Eulji...