1. From the Department of Internal Medicine, Eulji University Hospital, Daejeon, Korea (S.H.P., K.T.J.); Department of Internal Medicine, Sejong General Hospital, Bucheon, Korea (K.-H.J.); Department of Internal Medicine (J.M.L., H.-Y.L., B.-K.K.) and Institute of Aging (B.-K.K.), Seoul National University Hospital, Seoul, Korea; Department of Internal Medicine, Keimyung University Dongsan Medical Center, Daegu, Korea (C.-W.N.); Department of Internal Medicine, Inje University Ilsan Paik Hospital,...